SERVER-84384 recently changed the behaviour of the checkHistoricalPlacementMetadataConsistency() method for resharding temporary collections, so that

• their metadata is expected to appear within config.collections and config.chunks, but not within config.placementHistory, as a consequence of how the server code implements reshardCollection
• JS tests that forge resharding temporary collections (most commonly, by running shardCollection commands are considered logic that breaks such a rule (and are then expected to perform proper cleanup on test teardown, like here).

Nevertheless, JS mutational fuzzer tests cannot be easily modified to comply with the above rule - and would hence need a relaxed version of checkHistoricalPlacementMetadataConsistency() .