In a dated Altium Designer 21 field report, obj_batch_delete reported deleted=0 and failure while 25 target net labels had actually been deleted; emitting one schematic sheet rewrote five unrelated sheets and an old PCB through application.save_all; component replacement updated library references without replacing the placed symbol. The reporter source-confirmed items M01 and M02 against upstream on 2026-10-19; M05 is recorded as a live observation with root cause open.