So I was in a cave when I spotted an Enderman. When I hit it, no red border showed around the mob (the red border is the one seen around the baby horse in the photo attached). Spawning and hitting a zombie in the cave confirmed the problem.
Steps to Reproduce:
1. Go into a dark, low-elevation cave
2. Drink a night vision potion
3. Spawn in any hostile mob. Hit it, and see the problem for yourself.
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duplicates 1
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Kumasasa, you rephrased the title weirdly. Some people could think it means that the mobs have the night vision effect on them.
Did you drink night vision potion while being underground ? If so, duplicate of MC-4222