A Vex and Allay in a minecart or a boat will be sitting lower than it should, with part of it's texture going underneath. Just Similar MC-257349 & MC-249806 has been Fix
Step To Produce
Spawn Vex or Allay
Take Any Minecarts With Rails and Boats
Command ride @e [type=vex/allay] start_riding @e [type=(Any Ride)]
Observed Result
Vex and Allay Looks Sitting Lower Just Like Java Edition
[media]
Expected Behavior
Vex and Allay Should Can Sitting Above From minecarts and Boats
Texture going underneath in the boat and minecart for only a couple of pixels. But this is really not how Java works.
The problem with rafts is tracked separately, since this is the problem for all mobs (MCPE-163328).
Java
Bedrock