Shulkers teleport when hit by snowballs and eggs while below half of their health

When below half health, shulkers will teleport when hit by thrown snowballs and eggs

Steps to reproduce:

• Go up in the air so that no blocks are within about 25 blocks of distance

• Build the setup shown in the attached image. Make sure the shulker has glass all around it except for the trapdoor

• summon a shulker in the location shown using the command /summon shulker ~ ~ ~ {Health:14f} or a similar command

• use the command /data get entity @e[type=shulker,limit=1] Health to confirm that the shulker's health is 14

• spawn multiple snow golems in the location shown

• wait for about 1-2 minutes for the shulker to teleport away from its original spot

• verify that the shulker still has a health of 14 using the command /data get entity @e[type=shulker,limit=1] Health

A similar process can be used with eggs, either using a dispenser on a clock or the player.

Expected: shulkers do not teleport from snowballs or eggs, since the shulker does not take damage from them

Observed: shulkers treat snowballs and eggs as a form of damage and teleport because of them