fixes#5810
probably fixes#4986#5810 was caused by the workaround for #4394, which broke in 1.20 for reasons I'm still unclear on.
As FLAG_TELEPORT does not work at all for non-player entities, and causes bugs with player entities, sending the teleport movement without the flag is the least buggy way to solve all of these issues. Having the client interpolate teleport movements is not ideal, but there doesn't seem to be a way to reliably prevent it without causing even more bugs, so this will have to do.