Endermen, striders, snow golems, and blazes are not hurt by water if they are riding a boat. Interestingly, they do take damage when wet in minecarts.
What I expected to happen was...:
Water-vulnerable mobs would take damage to water, even while in a boat.
What actually happened was...:
Water-vulnerable mobs do not take damage.
Steps to Reproduce:
1. Create a two-block-deep pit that is large enough to fit a boat.
2. Place signs along the floor of the pit (so the boat does not eject its passenger).
3. Place a boat with your favorite water-vulnerable mob amongst the signs.
4. Place a water source on the upper layer of the pit and observe that the water touches the water-vulnerable mob, but does not cause it to take damage.
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Thank you for your report!
We're tracking this issue in MC-254597, so this ticket is being resolved and linked as a duplicate.
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Seems to be the same issue as MC-252214.