NoAI Shulker riding a Marker Armorstand gets dislocated in water

Expected:
Shulker stays on top of armor stand
Actual:
Shulker is unattached and moved to nearby air block
Video
Steps to reproduce:
Run this:

/summon minecraft:armor_stand ~ ~ ~ {Marker:1,Passengers:[{id:Shulker,NoAI:1}]}

Place water on or nearby