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PEP-rounded drawings can leave a contour 1e-6 short of closing. ShapeBuilder chains it as a loop at Tolerance.ChainTolerance, but the slide classifier re-recovered loops at 1e-7, so the whole part became unresolved and every contact with it blocked. Parts placed in its cutout at exactly the part spacing could not be pushed (Y/X keys) in any direction, even away from the wall. Recover loops with the same tolerance ShapeBuilder uses. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>