The Collection isolation implemented for lock free reads that resides inside the CollectionCatalog is implemented as a decoration on the OperationContext. This leads to SideTransaction's to observe uncommitted state from their parent.

Multikey is set inside a SideTransaction and need to operate directly on the DurableCatalog because it cannot trust the metadata in the Collection because of this.

The isolation should be implemented either like UncommittedCollections where the TransactionParticipant can detach/attach the state. Or as a decoration on the RecoveryUnit.