When in a minecart, the enderman tries to teleport several times, even without being hit by a projectile or damaged by water or rain. It seems to only happen when it's under daylight.
How to reproduce:
1. Set time to day:
/time set day
2. Summon an enderman riding a minecart:
/summon minecraft:minecart ~ ~ ~ {Passengers:[{id:"minecraft:enderman"}]}
3. Close to the ground, wait and listen.
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I am also able to confirm that this is an issue.

Can confirm in 1.21 Pre-Release 4.

Can confirm in 1.21.
This also occurs with boats.

I think this bug is caused by the mechanism of the item called " eyes of ender "

@unknown I don't think so.

Endermen teleport more frequently during the day, I wonder if that's the reason.

In 24w34a and 1.21.1
Can confirm.