Shulkers Glitch When Teleporting Out of Lava

Verification builds:
1.1.1.0 Retail

Summary:
Shulkers teleport out of lava, but they glitch back and forth rapidly as they teleport.

Steps to Reproduce:

1. Spawn a shulker in a pool of lava

Observed Results:
The shulker teleports out of the lava, and glitches back and forth.

Expected Results:
It should smoothly teleport out of the lava, once.

Screenshots/Videos attached: Yes

Notes:
Video: https://youtu.be/mwBLXaHVEbA