Steps to reproduce:

1. Summon a creaking.
2. Summon a shulker behind it.
3. Go into survival mode.
4. Position yourself in front of the creaking (so it freezes), in line with the shulker.
5. Once the shulker bullet hits the creaking, it floats up into the air.

What I expected to happen:
As the creaking is anchored to the ground it should be immune to levitation.