While under the effect of a night vision potion, enemies no longer flash red upon taking damage.
UPDATE: This only occurs if the mob is in a location that would normally be dark (such as an unlit cave) if you didn't have night vision. It works correctly in well lit areas.
Linked issues
is duplicated by 1
Comments 8
Upon further experimentation, I have determined that this only occurs in low-light areas (areas that would normally be completely dark if you didn't have night vision). It works fine in well-lit areas, which is probably why you couldn't produce it.
I have updated the description with this information.
I'm not sure if this is what you mean, but I tested it and they seem to flash grey instead of red. This may be due to the blue tinting of the potion on top of the red.
Can confirm what David said.
In a complete dark cave the mob flashes dark grey. When I place a single torch, it flashes dark red.
Unable to reproduce.