take the stair
stand on shulkerbox and open it
ride on anything
those 3 things will call the api event EnterExitRegionEvent
even when player still in the region

1.16.4 papermc
btw i rewrote the event in my plugin via redprotect api
and it worked perfectly on the same server
so i don’t think it is server’s problem?

No versions :/
Btw this is caused by server events sending wrong info to plugins. Is not redprotect problems.