Priority was sorted descending, the reverse of the host (StockLadder and NestJobCandidateComparer treat a lower number as more important), so a priority-9 part beat a priority-0 part for scarce stock. The existing test encoded the inverted rule and now asserts the host's direction. Part geometry filtered only rapids, so scribe/etch moves counted as material - the bug OpenNest fixed in 1b5e1b1. Use SpecialLayers.IsMaterial. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>