How to reproduce
Create a superflat world in creative that has the preset:
minecraft:bedrock,5*minecraft:stone,5*minecraft:dirt,5*minecraft:sand,minecraft:water;minecraft:deep_ocean;oceanmonument,biome_1
Get away from any shipwrecks and ocean ruins (so that the enderman can't teleport there)
Spawn an enderman in the water and it wont teleport anywhere
Run the command:
/fill ~ ~ ~ ~63 ~ ~63 minecraft:cobblestone_slab[waterlogged=true]
Spawn an enderman on said giant slab of submerged cobblestone slabs
→ Notice that the enderman is teleporting
Note
The reason why this is a glitch is because of the inconsistency of endermen teleporting or not in the water.
Linked issues
relates to
Comments


still in 1.14.1, should add that to the affected versions
Thanks for formatting it better!