I have also had to deal with this, suffered from multiple weeks of work lost. Assumed the solution was failed, still suffered from the losses. Even copying the level directly seemed to induce the problem in the copied level. I found a ‘workaround’, but that’s a generous term: I discovered their packed level instances didn’t suffer from the crashes or corruptions, so I manually divided the world into PLIs and saved them as seperate folders. In the event of an engine crash, I would reconstruct the world using the PLIs.
Functionally, I was hacking together world composition, and it was a nightmare to use. World partition, when it works, is amazing. And I haven’t tested how well it works with any of the new engine versions, but I believe world partition needs to work well and consistantly, in order for UE5 to be shippable.