Undo in a multi user session is handled differently amongst clients

[JannikStreek]

Describe the bug
In a multi user session: If client A cuts + pastes nodes and undos the paste, the whole pasting step is correctly reverted. If client A pastes and client B reverts, it only reverts one node of the pasted content.

Expected behavior
Undo should behave the same amongst clients, reverting all the pasted content.