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The compute\u0027s abort path for RescheduledByPolicyException\ndoes not notify the scheduler, so the stale UUID persists until the\nnext periodic sync_instance_info clears it.\n\nThe stale entry causes ServerGroupAntiAffinityFilter to over-count\ngroup members on the host, potentially blocking valid placements\nwith spurious NoValidHost errors.\n\nThis adds a functional regression test that demonstrates the cache\npollution. The test currently asserts the buggy behaviour (stale\nentry present). 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