Heya, cheers. I'm actually intimately familiar with the node splitting issue. I've created y-prosemirror backends(complete with edit history, snapshots, etc) and "rewrote" y-prosemirror in TypeScript heavily refactoring and modifying it for some crazy use cases.

Those use cases hit a wall with, and I'm a bit fuzzy, the Yjs data structure and y-promirror diffing algorithm destroying and creating new XML nodes; black-holing anything else that occurred in them or duplicating content.