Shulkers can push marker armour stands

The bug

When a shulker opens its shell, it can push armour stands with the tag {Marker:1b}. Expected behaviour would be that the armour stand doesn't move.

How to reproduce

1. Spawn a shulker on the ground

2. Summon a marker armour stand above the shulker

   /execute at @e[type=shulker,limit=1,sort=nearest] run summon armor_stand ~ ~1 ~ {Marker:1}

   /execute at @e[type=shulker,limit=1,sort=nearest] run summon armor_stand ~ ~1 ~ {Marker:1}

3. Wait until the shulker opens its shell slightly
   → ❌  The armour stand is pushed upwards