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FA-51266 / Raster clipping / Open access

Overlap count clip regions: single threshold · case 01

Exactly-one clipping accepts multiply covered samples.

Verified by executionVariant 1 · 12 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Exactly-one clipping accepts multiply covered samples.

THE FAILURE

Exactly-one clipping accepts multiply covered samples.

Unsuccessful approach: Allowing counts below one includes uncovered samples.

Case contract

Sources contribute unique sample sets to an overlap-count clip. Replacing a source first removes its old contribution. Removing an unknown source is inert. Coverage may select union, exactly-one, at-least-two or odd count. Moving a source translates its retained original sample set before clipping to the target, allowing previously exterior samples to enter. Draw emits selected finite samples.

Why this case matters

Raster clip state can leak coverage across draws even when every individual region is valid.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(commands, size):
    full=set(range(size))
    sources={}
    counts={x:0 for x in full}
    mode='union'
    out=[]
    for cmd in commands:
        op=cmd[0]
        if op in ('put','move','remove'):
            key=cmd[1]
            old=sources.get(key,set())
            for x in old & full: counts[x]-=1
            if op=='put': new=set(cmd[2])
            elif op=='move': new={x+cmd[2] for x in old}
            else: new=set()
            if op=='remove': sources.pop(key,None)
            else: sources[key]=new
            for x in new & full: counts[x]+=1
        elif op=='mode': mode=cmd[1]
        elif op=='draw':
            if mode=='union': selected=[x for x in full if counts[x]>0]
            elif mode=='single': selected=[x for x in full if counts[x]>0]
            elif mode=='overlap': selected=[x for x in full if counts[x]>=2]
            else: selected=[x for x in full if counts[x]%2==1]
            out.append(sorted(selected))
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['put', 'a', [0, 1]], ['put', 'a', [2]], ['draw']], 4), [[2]])
    check('explicit sequence 1', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['draw']], 4), [[0]])
    check('explicit sequence 2', solve([['put', 'a', [-1]], ['move', 'a', 2], ['draw']], 4), [[1]])
    check('explicit sequence 3', solve([['put', 'a', [2]], ['move', 'a', -1], ['draw']], 4), [[1]])
    check('explicit sequence 4', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['remove', 'a'], ['draw']], 4), [[0]])
    check('explicit sequence 5', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'overlap'], ['draw']], 4), [[0]])
    check('explicit sequence 6', solve([['put', 'a', [0]], ['mode', 'single'], ['draw']], 4), [[0]])
    check('explicit sequence 7', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'single'], ['draw']], 4), [[]])
    check('explicit sequence 8', solve([['put', 'a', [0]], ['put', 'b', [0]], ['put', 'c', [0]], ['mode', 'overlap'], ['draw'], ['mode', 'odd'], ['draw']], 4), [[0], [0]])
    check('explicit sequence 9', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'odd'], ['draw']], 4), [[]])
    check('explicit sequence 10', solve([['put', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['draw']], 4), [[0, 1, 2, 3]])
    check('explicit sequence 11', solve([['put', 'a', [0, 1]], ['put', 'b', [1]], ['draw']], 4), [[0, 1]])
if N == 2:
    check('explicit sequence 0', solve([['put', 'a', [0, 1]], ['put', 'a', [2]], ['draw']], 5), [[2]])
    check('explicit sequence 1', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['draw']], 5), [[0]])
    check('explicit sequence 2', solve([['put', 'a', [-1]], ['move', 'a', 2], ['draw']], 5), [[1]])
    check('explicit sequence 3', solve([['put', 'a', [2]], ['move', 'a', -1], ['draw']], 5), [[1]])
    check('explicit sequence 4', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['remove', 'a'], ['draw']], 5), [[0]])
    check('explicit sequence 5', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'overlap'], ['draw']], 5), [[0]])
    check('explicit sequence 6', solve([['put', 'a', [0]], ['mode', 'single'], ['draw']], 5), [[0]])
    check('explicit sequence 7', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'single'], ['draw']], 5), [[]])
    check('explicit sequence 8', solve([['put', 'a', [0]], ['put', 'b', [0]], ['put', 'c', [0]], ['mode', 'overlap'], ['draw'], ['mode', 'odd'], ['draw']], 5), [[0], [0]])
    check('explicit sequence 9', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'odd'], ['draw']], 5), [[]])
    check('explicit sequence 10', solve([['put', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['draw']], 5), [[0, 1, 2, 3, 4]])
    check('explicit sequence 11', solve([['put', 'a', [0, 1]], ['put', 'b', [1]], ['draw']], 5), [[0, 1]])
if N == 3:
    check('explicit sequence 0', solve([['put', 'a', [0, 1]], ['put', 'a', [2]], ['draw']], 6), [[2]])
    check('explicit sequence 1', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['draw']], 6), [[0]])
    check('explicit sequence 2', solve([['put', 'a', [-1]], ['move', 'a', 2], ['draw']], 6), [[1]])
    check('explicit sequence 3', solve([['put', 'a', [2]], ['move', 'a', -1], ['draw']], 6), [[1]])
    check('explicit sequence 4', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['remove', 'a'], ['draw']], 6), [[0]])
    check('explicit sequence 5', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'overlap'], ['draw']], 6), [[0]])
    check('explicit sequence 6', solve([['put', 'a', [0]], ['mode', 'single'], ['draw']], 6), [[0]])
    check('explicit sequence 7', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'single'], ['draw']], 6), [[]])
    check('explicit sequence 8', solve([['put', 'a', [0]], ['put', 'b', [0]], ['put', 'c', [0]], ['mode', 'overlap'], ['draw'], ['mode', 'odd'], ['draw']], 6), [[0], [0]])
    check('explicit sequence 9', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'odd'], ['draw']], 6), [[]])
    check('explicit sequence 10', solve([['put', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['draw']], 6), [[0, 1, 2, 3, 4, 5]])
    check('explicit sequence 11', solve([['put', 'a', [0, 1]], ['put', 'b', [1]], ['draw']], 6), [[0, 1]])
if N == 4:
    check('explicit sequence 0', solve([['put', 'a', [0, 1]], ['put', 'a', [2]], ['draw']], 7), [[2]])
    check('explicit sequence 1', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['draw']], 7), [[0]])
    check('explicit sequence 2', solve([['put', 'a', [-1]], ['move', 'a', 2], ['draw']], 7), [[1]])
    check('explicit sequence 3', solve([['put', 'a', [2]], ['move', 'a', -1], ['draw']], 7), [[1]])
    check('explicit sequence 4', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['remove', 'a'], ['draw']], 7), [[0]])
    check('explicit sequence 5', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'overlap'], ['draw']], 7), [[0]])
    check('explicit sequence 6', solve([['put', 'a', [0]], ['mode', 'single'], ['draw']], 7), [[0]])
    check('explicit sequence 7', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'single'], ['draw']], 7), [[]])
    check('explicit sequence 8', solve([['put', 'a', [0]], ['put', 'b', [0]], ['put', 'c', [0]], ['mode', 'overlap'], ['draw'], ['mode', 'odd'], ['draw']], 7), [[0], [0]])
    check('explicit sequence 9', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'odd'], ['draw']], 7), [[]])
    check('explicit sequence 10', solve([['put', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['draw']], 7), [[0, 1, 2, 3, 4, 5, 6]])
    check('explicit sequence 11', solve([['put', 'a', [0, 1]], ['put', 'b', [1]], ['draw']], 7), [[0, 1]])
if N == 5:
    check('explicit sequence 0', solve([['put', 'a', [0, 1]], ['put', 'a', [2]], ['draw']], 8), [[2]])
    check('explicit sequence 1', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['draw']], 8), [[0]])
    check('explicit sequence 2', solve([['put', 'a', [-1]], ['move', 'a', 2], ['draw']], 8), [[1]])
    check('explicit sequence 3', solve([['put', 'a', [2]], ['move', 'a', -1], ['draw']], 8), [[1]])
    check('explicit sequence 4', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['remove', 'a'], ['draw']], 8), [[0]])
    check('explicit sequence 5', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'overlap'], ['draw']], 8), [[0]])
    check('explicit sequence 6', solve([['put', 'a', [0]], ['mode', 'single'], ['draw']], 8), [[0]])
    check('explicit sequence 7', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'single'], ['draw']], 8), [[]])
    check('explicit sequence 8', solve([['put', 'a', [0]], ['put', 'b', [0]], ['put', 'c', [0]], ['mode', 'overlap'], ['draw'], ['mode', 'odd'], ['draw']], 8), [[0], [0]])
    check('explicit sequence 9', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'odd'], ['draw']], 8), [[]])
    check('explicit sequence 10', solve([['put', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['draw']], 8), [[0, 1, 2, 3, 4, 5, 6, 7]])
    check('explicit sequence 11', solve([['put', 'a', [0, 1]], ['put', 'b', [1]], ['draw']], 8), [[0, 1]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
explicit sequence 0[[2]][[2]]Passed
explicit sequence 1[[0]][[0]]Passed
explicit sequence 2[[1]][[1]]Passed
explicit sequence 3[[1]][[1]]Passed
explicit sequence 4[[0]][[0]]Passed
explicit sequence 5[[0]][[0]]Passed
explicit sequence 6[[0]][[0]]Passed
explicit sequence 7[[0]][[]]Failed
explicit sequence 8[[0], [0]][[0], [0]]Passed
explicit sequence 9[[]][[]]Passed
explicit sequence 10[[0, 1, 2, 3]][[0, 1, 2, 3]]Passed
explicit sequence 11[[0, 1]][[0, 1]]Passed

SHA-256 / c8fbc62e2f995527bed547c1cdcd280b31a4c30fe0263a66da8f7444f2e5fd08

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(commands, size):
    full=set(range(size))
    sources={}
    counts={x:0 for x in full}
    mode='union'
    out=[]
    for cmd in commands:
        op=cmd[0]
        if op in ('put','move','remove'):
            key=cmd[1]
            old=sources.get(key,set())
            for x in old & full: counts[x]-=1
            if op=='put': new=set(cmd[2])
            elif op=='move': new={x+cmd[2] for x in old}
            else: new=set()
            if op=='remove': sources.pop(key,None)
            else: sources[key]=new
            for x in new & full: counts[x]+=1
        elif op=='mode': mode=cmd[1]
        elif op=='draw':
            if mode=='union': selected=[x for x in full if counts[x]>0]
            elif mode=='single': selected=[x for x in full if counts[x]<=1]
            elif mode=='overlap': selected=[x for x in full if counts[x]>=2]
            else: selected=[x for x in full if counts[x]%2==1]
            out.append(sorted(selected))
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['put', 'a', [0, 1]], ['put', 'a', [2]], ['draw']], 4), [[2]])
    check('explicit sequence 1', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['draw']], 4), [[0]])
    check('explicit sequence 2', solve([['put', 'a', [-1]], ['move', 'a', 2], ['draw']], 4), [[1]])
    check('explicit sequence 3', solve([['put', 'a', [2]], ['move', 'a', -1], ['draw']], 4), [[1]])
    check('explicit sequence 4', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['remove', 'a'], ['draw']], 4), [[0]])
    check('explicit sequence 5', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'overlap'], ['draw']], 4), [[0]])
    check('explicit sequence 6', solve([['put', 'a', [0]], ['mode', 'single'], ['draw']], 4), [[0]])
    check('explicit sequence 7', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'single'], ['draw']], 4), [[]])
    check('explicit sequence 8', solve([['put', 'a', [0]], ['put', 'b', [0]], ['put', 'c', [0]], ['mode', 'overlap'], ['draw'], ['mode', 'odd'], ['draw']], 4), [[0], [0]])
    check('explicit sequence 9', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'odd'], ['draw']], 4), [[]])
    check('explicit sequence 10', solve([['put', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['draw']], 4), [[0, 1, 2, 3]])
    check('explicit sequence 11', solve([['put', 'a', [0, 1]], ['put', 'b', [1]], ['draw']], 4), [[0, 1]])
if N == 2:
    check('explicit sequence 0', solve([['put', 'a', [0, 1]], ['put', 'a', [2]], ['draw']], 5), [[2]])
    check('explicit sequence 1', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['draw']], 5), [[0]])
    check('explicit sequence 2', solve([['put', 'a', [-1]], ['move', 'a', 2], ['draw']], 5), [[1]])
    check('explicit sequence 3', solve([['put', 'a', [2]], ['move', 'a', -1], ['draw']], 5), [[1]])
    check('explicit sequence 4', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['remove', 'a'], ['draw']], 5), [[0]])
    check('explicit sequence 5', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'overlap'], ['draw']], 5), [[0]])
    check('explicit sequence 6', solve([['put', 'a', [0]], ['mode', 'single'], ['draw']], 5), [[0]])
    check('explicit sequence 7', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'single'], ['draw']], 5), [[]])
    check('explicit sequence 8', solve([['put', 'a', [0]], ['put', 'b', [0]], ['put', 'c', [0]], ['mode', 'overlap'], ['draw'], ['mode', 'odd'], ['draw']], 5), [[0], [0]])
    check('explicit sequence 9', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'odd'], ['draw']], 5), [[]])
    check('explicit sequence 10', solve([['put', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['draw']], 5), [[0, 1, 2, 3, 4]])
    check('explicit sequence 11', solve([['put', 'a', [0, 1]], ['put', 'b', [1]], ['draw']], 5), [[0, 1]])
if N == 3:
    check('explicit sequence 0', solve([['put', 'a', [0, 1]], ['put', 'a', [2]], ['draw']], 6), [[2]])
    check('explicit sequence 1', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['draw']], 6), [[0]])
    check('explicit sequence 2', solve([['put', 'a', [-1]], ['move', 'a', 2], ['draw']], 6), [[1]])
    check('explicit sequence 3', solve([['put', 'a', [2]], ['move', 'a', -1], ['draw']], 6), [[1]])
    check('explicit sequence 4', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['remove', 'a'], ['draw']], 6), [[0]])
    check('explicit sequence 5', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'overlap'], ['draw']], 6), [[0]])
    check('explicit sequence 6', solve([['put', 'a', [0]], ['mode', 'single'], ['draw']], 6), [[0]])
    check('explicit sequence 7', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'single'], ['draw']], 6), [[]])
    check('explicit sequence 8', solve([['put', 'a', [0]], ['put', 'b', [0]], ['put', 'c', [0]], ['mode', 'overlap'], ['draw'], ['mode', 'odd'], ['draw']], 6), [[0], [0]])
    check('explicit sequence 9', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'odd'], ['draw']], 6), [[]])
    check('explicit sequence 10', solve([['put', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['draw']], 6), [[0, 1, 2, 3, 4, 5]])
    check('explicit sequence 11', solve([['put', 'a', [0, 1]], ['put', 'b', [1]], ['draw']], 6), [[0, 1]])
if N == 4:
    check('explicit sequence 0', solve([['put', 'a', [0, 1]], ['put', 'a', [2]], ['draw']], 7), [[2]])
    check('explicit sequence 1', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['draw']], 7), [[0]])
    check('explicit sequence 2', solve([['put', 'a', [-1]], ['move', 'a', 2], ['draw']], 7), [[1]])
    check('explicit sequence 3', solve([['put', 'a', [2]], ['move', 'a', -1], ['draw']], 7), [[1]])
    check('explicit sequence 4', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['remove', 'a'], ['draw']], 7), [[0]])
    check('explicit sequence 5', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'overlap'], ['draw']], 7), [[0]])
    check('explicit sequence 6', solve([['put', 'a', [0]], ['mode', 'single'], ['draw']], 7), [[0]])
    check('explicit sequence 7', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'single'], ['draw']], 7), [[]])
    check('explicit sequence 8', solve([['put', 'a', [0]], ['put', 'b', [0]], ['put', 'c', [0]], ['mode', 'overlap'], ['draw'], ['mode', 'odd'], ['draw']], 7), [[0], [0]])
    check('explicit sequence 9', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'odd'], ['draw']], 7), [[]])
    check('explicit sequence 10', solve([['put', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['draw']], 7), [[0, 1, 2, 3, 4, 5, 6]])
    check('explicit sequence 11', solve([['put', 'a', [0, 1]], ['put', 'b', [1]], ['draw']], 7), [[0, 1]])
if N == 5:
    check('explicit sequence 0', solve([['put', 'a', [0, 1]], ['put', 'a', [2]], ['draw']], 8), [[2]])
    check('explicit sequence 1', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['draw']], 8), [[0]])
    check('explicit sequence 2', solve([['put', 'a', [-1]], ['move', 'a', 2], ['draw']], 8), [[1]])
    check('explicit sequence 3', solve([['put', 'a', [2]], ['move', 'a', -1], ['draw']], 8), [[1]])
    check('explicit sequence 4', solve([['put', 'a', [0]], ['put', 'b', [0]], ['remove', 'a'], ['remove', 'a'], ['draw']], 8), [[0]])
    check('explicit sequence 5', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'overlap'], ['draw']], 8), [[0]])
    check('explicit sequence 6', solve([['put', 'a', [0]], ['mode', 'single'], ['draw']], 8), [[0]])
    check('explicit sequence 7', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'single'], ['draw']], 8), [[]])
    check('explicit sequence 8', solve([['put', 'a', [0]], ['put', 'b', [0]], ['put', 'c', [0]], ['mode', 'overlap'], ['draw'], ['mode', 'odd'], ['draw']], 8), [[0], [0]])
    check('explicit sequence 9', solve([['put', 'a', [0]], ['put', 'b', [0]], ['mode', 'odd'], ['draw']], 8), [[]])
    check('explicit sequence 10', solve([['put', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['draw']], 8), [[0, 1, 2, 3, 4, 5, 6, 7]])
    check('explicit sequence 11', solve([['put', 'a', [0, 1]], ['put', 'b', [1]], ['draw']], 8), [[0, 1]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
explicit sequence 0[[2]][[2]]Passed
explicit sequence 1[[0]][[0]]Passed
explicit sequence 2[[1]][[1]]Passed
explicit sequence 3[[1]][[1]]Passed
explicit sequence 4[[0]][[0]]Passed
explicit sequence 5[[0]][[0]]Passed
explicit sequence 6[[0, 1, 2, 3]][[0]]Failed
explicit sequence 7[[1, 2, 3]][[]]Failed
explicit sequence 8[[0], [0]][[0], [0]]Passed
explicit sequence 9[[]][[]]Passed
explicit sequence 10[[0, 1, 2, 3]][[0, 1, 2, 3]]Passed
explicit sequence 11[[0, 1]][[0, 1]]Passed

SHA-256 / 5b61bf9834322ef0022c07e92610787966bfcf8dc1ace6431463a712868d3ea8

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 12 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

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Verification & scope

Finite one-dimensional integer sample sets model coverage state only; no geometric intersection, memory layout, GPU or graphics-standard conformance is claimed. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:45:17.390306+00:00.

Case digest / 85257d2ade8145a7a3bf1ae27d1eae96db6198aef8229740de7eb4894eb51b53