Describe the bug
Trapdoors (at least wooden ones, i've yet to use others) that don't have a block beneath them seem to sometimes gain "gravity" like sand/gravel does, and they fall from where they were initially placed.

To Reproduce
Place a (wooden) trapdoor on the side of a block like normal, but with no blocks/ladders underneath it. Maybe try activate the automatic opening it does when you walk over it/bump off it, that might be what trigger this.

Expected behavior
The trapdoor should fall as though it's got gravity, similar to sand/gravel. It may also break depending on what it lands on.

Info:

• Modpack Version: 3.0 Beta 3
• Server or Singleplayer: Akliz Server
• Version the world was created on: 3.0 Beta 3

couldnt reproduce this on dev