Development record

TestAnAutoPlanStepRefusesASharedMainCheckoutBeforeItPlans failed in the merge queue's check (macos-latest) job (run 41358066383, the race stage over the whole module) on a merge group whose change touched records only: build_autoplan_surface_test.go:117 'the plan step backs off in a shared main checkout: exit 0'. The step it tests is meant to refuse in a main checkout that two or more live sessions started in, and it exited 0 instead. The same test passed elsewhere, so it is flaky on macOS under the race detector or depends on timing, and each failure ejects the queue's entries: PR 1337 was removed from the queue at 23:52 and waited to be queued again.