In checkMetadataConsistency (checkCollectionMetadataInShardCatalog), we are reading the Authoritative Shards feature flag then validating the durable shard catalog entries without taking into account that the FCV may be concurrently downgraded and the shard will become non-authoritative.

This can cause checkMetadataConsistency to report a false positive if it runs concurrently to a FCV downgrade (see attached repro).