Summoned shulkers aren't instantly aligned to block grid

Spawning a shulker via the /summon command causes the shulker to not be aligned to the block grid for a tick.

To reproduce

1. Stand on the ground

2. /summon Shulker ~ ~ ~

3. Watch closely to see the issue

Attached video provided by [Mod] Les3awe for MC-89141
Note: Attached video shows this issue by using spawn eggs, which is already fixed.