#2064 (multi-profile extrusion) merges coplanar faces the boolean used to leave split. Seeds 67 and 94 change face/edge counts at the same volume; seed 13 has four fewer edges before its random fillet, which then picks different edges by index. Every step still passes the validity and volume-direction checks. Pull request CI runs every 8th seed only, so main's full run was the first to see these. Co-authored-by: Claude Opus 5.5 <[email protected]>