A change will be made in 1.4.10. Let me know if it fixes your issue when you get it.
Great! I’ll keep an eye out.
Simplest workaround for anyone else hitting this: pause sync while you’re working, resume when you’re done.
Just to wrap up my last test case, the same problem does happen out of iCloud. I also notice that there’s a non-hang case, where you just see significant lag in what you type vs what’s reflected on the screen.
Seems fixed after update, thanks again.