Mooshroom mushrooms glow on the dark when the player (not the mob) is near a light source

The mushrooms on the backs of red and brown mooshrooms can shine in the dark if the player is in the light.

• Steps to reproduce the issue: Go to a mooshroom biome, wait for the night, and place a torch on the ground. While looking at a mooshroom that is standing in the dark, move in and out of the torch light.

• Expected result: The entire mooshroom remains dark, because it is in the dark.

• Actual result: The mushrooms on the back of the mooshroom shine when the player is near a light source, and darken when the player is not. It appears the light on those mushrooms is responding to the light level the player is located in rather than the light level the cow is in.

The attached screenshots were taken on a realm. I have Vibrant Visuals on and a friend does not. We both saw the same glowing mushrooms, so this is not a VV-specific bug.

(Edit: updated to reflect that this applies to brown mooshrooms too.)