Crash When Placing Vertical Slabs on Non-Full Blocks

[Zackonark]

I found this with this simple set up: any full block next to biomesoplenty:plant_0 (aka short grass). Try to place a normal slab (not one from the vertical slabs creative menu) on the grass by clicking the side of the full block next to it (to place it as a vertical slab), and the game will crash. Tried with vanilla saplings, flowers, and shrooms and in every case I could not place the slab (I would imagine because of the crash). However a snow layer will allow me to place the slab, and will also crash

[CJMinecraft01]

Hi there! Apologies for the extreme delay, I've had a really hectic year at university so haven't had chance to look at any of the issues. Which Double Slabs version does this occur on? Thanks