World gen of A Crude Start goes just fine, but the game immediately experiences a fatal error if the rock or stick items drop as a physics object, either by breaking or by dropping from the creative inventory:

The game crashed whilst ticking entity
Error: java.lang.IllegalArgumentException: Cannot set property PropertyDirection{name=facing, clazz=class net.minecraft.util.EnumFacing, values=[north, south, west, east]} to down on block crude_start:rock, it is not an allowed value

(full error log here)

Crash does not occur when block is simply destroyed in creative. This is pretty apparently an issue on the other mod's side, but they have no issue page and I have functionally no knowledge of java with which to comb through and see what the problem might be in their code.

My proposed stop-gap solution: Is there any way to blacklist certain items/objects as not effected by this mod's physics?

Version Info:
MC 1.12.2
Forge 14.23.5.2836
Item Physics Full 1.4.21

The issue should be fixed, just update CreativeCore and it should work fine.