Fire animation is dark for spiders, endermen and phantoms

The bug

When a spider, enderman or phantom is on fire, the mob itself is bright but the fire animation uses the same brightness as the surroundings (causing it to appear dark in dark places). All of these mobs use multiple layers for glowing eyes.

To reproduce

Set a spider, enderman or phantom on fire in a dark area (e.g. night time), and compare the flame animation with that of any other mob.