Spawning a shulker via the /summon
command causes the shulker to not be aligned to the block grid for a tick.
To reproduce
Stand on the ground
/summon Shulker ~ ~ ~
Watch closely to see the issue
Attached video provided by @unknown for MC-89141
Note: Attached video shows this issue by using spawn eggs, which is already fixed.
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[media]
Confirmed for 15w51b