When running /ride
on the player every tick (or every other tick), if the player manually dismounts the vehicle entity, their position will become desynced (as in, they will no longer be riding the entity client-side but they still are server-side) until the vehicle entity dies or the player relogs. If the player crouches, their position will be briefly resynced, but this also dismounts the vehicle again.
Linked issues
is duplicated by 8
3 more links
Confirmed.