Shulkers can be spawned with the /summon command from Y -80 and up to Y 30,000,000 even though the build limit is -64 to 320 but after unloading the area they despawn
MCPE-187071
Shulkers can be spawned outside of the build limit
Resolved
Invalid
0
This is the same for every other entity in the game. The build limit applies only to blocks.