bucket_unpacking_with_sort_on_multiple_fields_point_queries.js fails intermittently in
sharded_collections_jscore_passthrough_with_config_transitions_and_add_remove_shard because its explain validation (findFirstMatch) cannot find the bucket-span $match stage when the query planner absorbs it into $cursor in a sharded context. The optimization is correct; the test's explain check is fragile.

SERVER-125071 tracks the proper and full fix.