The Glow effect on some mobs (the outline drawn when mobs are hit by spectral arrows) draws incorrectly). See screenshots
All mobs: Outline does not draw around item in hands.
Slimes: Only draws the outline around he inner cubes. (Magma cubes draw correctly though)
Sheep: Like the slimes, the outline is around the body under the wool
Zombies: There is a gap near the head
Skeletons: Gap near head, around arms, and "holes" between ribs are not drawn
Chicken: outline around legs has a huge gap
Bats: Outline is offset with wings
Silverfish: Outline does not conform to pixels
Zombie pigman: Gap in areas where there is no hat layer.
Endermen: They teleport away when the arrow comes close. However, they still get the glow effect as if they were hit.
Technically a dupe of MC-83387, but this should be the main ticket as it's more detailed.