Entity shadows disappear when far away from the mob who casts them

The bug

When far enough way from an entity, its shadow disappears. I'm unsure whether that's intentional or not.

Video

Minecraft 1.14.4 2019-10-12 00-20-38.mp4

Note: despite to what can be seen in the videos, the shadow now slowly fades out as of 1.15.1.