If you put the enderman in a minecart or a boat you will notice that he still will teleport
Device: LG L10
MCPE-35884
Enderman can teleport while it is in a minecart or boat
Resolved
Duplicate
0
(Unassigned)
Unconfirmed
Phone - Android - LG Other (Specify in description)
Android 6.0
boat, enderman, minecart, teleport
1.6.0.6
Retrieved
This was reported already at MCPE-31761 and the design team decided this is working as intended for Bedrock.