As you can see in the attached screenshot, under the enderman's head, you can see through the water as if it's air. I assume somehow the special shape of the enderman model is interfering with the rendering of the water texture. I'm not a computer expert so I cannot know for certain though. I'll test if this happens with other mobs and leave updates if so.
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violine1101
Thank you for your report!
We're actually already tracking this issue in MC-9553, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.