Hi,
I'm using Mortal mod to remove gaps between walls when build vertically, and I tried to put a palissade from Decorative Blocks over it, but it crashed :

The game crashed whilst unexpected error
Error: java.lang.IllegalArgumentException: Cannot get property EnumProperty{name=up, clazz=class com.anbaric.mortar.blocks.MortarBlockWall$WallColumn, values=[pillar, up, none]} as it does not exist in Block{decorative_blocks:spruce_palisade}

Maybe there is something you can do to fix this issue

Minecraft 1.14.4, Forge 28.2.0