Expected Behavior

To pick up the slabfurnace like the other blocks

Actual Behavior

When picked up it has the blue and black box texture and when trying to place the item down, it doesn't allow it. Forces you to clear the item which is also deleting the items inside the slab furnaces

Steps to Reproduce

places two slab furnaces down op top of each other and pickup the the furnaces.

Version of Minecraft, Carry On, Forge

1.12.2
on the skyfactory 4 mp

Screenshots encouraged

This also occurs with stacked slab chests

I don't know how uploading to threads on github works, maybe should've read the rules or something but I'm just here to post this.

I placed a slab furnace under a slab crafting table.

It happened to me also.
v4.0.2

This happened to me when I placed a full furnace on top of my 2 stacked slab furnaces.

Seems To happen with all double stacked blocks from https://minecraft.curseforge.com/projects/slab-machines

Can't recreate this, if error persists please blacklist yourself and update to latest.