The cancellation test deliberately retires executable sources before their shells necessarily finish. Permit only the exact Plasma /bin/sh destruction warning in that test; keep all warnings fatal for queued-load cancellation and all other warnings fatal everywhere.

Reproduced 4 failures in 100 normal runs and 20 in 20 slowed-process runs. After the fix, 100 normal and 20 slowed runs passed; injected unexpected warnings and a queued-test cancellation warning still fail. This test-only correction changes no behavior, configuration, translations, or TODO, and maintained guides remain accurate.