I want to re-create some slabs that I found in the Minecraft Dungeons Swamp level. I want there to be a left edge block, a right edge block, a center block, and a thin block. I have 4 blocks created, each with a custom model provided by a texture pack that will overwrite the models so that you can tell them apart. I have a procedure that replaces the block you just placed with the correct type based on if there are block to the left or right, as well as updating the blocks around it, but I have run into an issue. Since these are 4 different slabs, it is really difficult to stack them up. whenever the state changes, I can no longer double-stack slabs unless I have the correct slab state in my hand. how can I fix this? The only way i can think of this is to have multiple blockstates for the slab instead of 4 different slabs, so that all 4 states are considered the same block, then change blockstates using my procedure, but I don't think that is possible. Any ideas?
also, here is the Imgur album:
https://imgur.com/a/cMCVazk