All players, including the host, sometimes roll back when they move.

Steps to reproduce the issue

1. about 20 players join the world

2. when moving, sometimes rollback occurs and the speed goes to 0.
   (This is especially likely to occur on stairs, ladders, and half blocks.)
   

Expected result
No rollback when moving unless there is lag

Actual result
rolls back even if no lag occurs, even if the host is not communicating