SERVER-96916 enforced stricter checks in establishConsistentCollection, assuming the commit pending entry always represents what the storage transaction will commit.

However, this is currently not true for multikey index builds committing, or for collections + indexes with multikey paths created within a txn.

The issue with index build commit is that it reuses the same CRUD path which sets multikeyness in an onCommit hook. For the commit case this should not be necessary, as the collection MODE_X lock is held.