This issue was addressed almost years ago, it is relatived to NSURLSessionWebSocket bug (fixed in iOS 16 probably) that receiving text websocket frame with some rarely used character.

I can’t mark your answer as accepted answer since I mark my answer as acceptable accidentally. 😢

Thanks for applying~ yep, you remind me that I should use data-related object to identify data instead of using UUID. But code listed post is not production code, and there is no reconstructing stuff around here. So it should not be the problem here. As u can see, this issue also occurs on official demo alongside session 10252. After moving an item from snapshot, re-apply this edited snapshot trigger an hidden cell DestinationPostCell:(0x000000015ed433c0) configured many times. That's what make me confuse. 🤯

After removing item at indexPath<0,0>, cell(0x000000015ef11940) is remove from screen(enqueue pool) and dequeue to display indexPath<1,1>, that's seem nothing wrong. But the cell<0x000000015ed433c0> which is a hidden cell, is confiugrated for many times. that make me confuse.