Horses' fur patterns are outlined by the glowing effect

The bug

The fur patterns on horses are outlined by the glowing effect. The expected behavior is that only the outer edge of the horse should be outlined. This bug existed previously as MC-124109, which was fixed in 21w10a, but it was reintroduced in 21w11a.

To reproduce

/summon horse ~ ~ ~ {Variant:773,NoAI:1b,Glowing:1b}