Versions

Betweenlands version:

3.2.1-alpha-snapshot

Forge version:

14.23.1.2555

Singleplayer or Multiplayer:

Singleplayer.

Installed mods:

nopotionshift 1.2.0, Optifine 1.12.2 C8, The Betweenlands 3.2.1-alpha-snapshot, Hwyla/Waila 1.8.23, and XYZing 1.0.

Description of the problem

How to reproduce: ( ͡° ͜ʖ ͡°)

1. Place upper slab.
2. Try to place door on upper slab.
3. Watch door pop off.

Expected result:

The door to place on the upper slab, like vanilla slabs.

Actual result:

It didn't place down, just popped off.

Pictures: