Sophisticated Backpacks Incompatiblity

[AllieDragon]

Hey, I have a modpack with flat colored blocks and sophisticated backpacks. It seems like when people put certain backpack upgrades in their backpack it causes an error with flat colored blocks that no longer allows them to open said backpacks. I brought it up to the authors of SB and they said it was an error on flat colored blocks part and that it'd have to be fixed by you guys. I added a pastebin link so you can see the error that is happening:
https://pastebin.com/w6XmzR9A

[Salandora]

Some more info on what I found when investigating the issue (what I wrote in the bug report I recieved):

So I gave this a good look and yeah I believe this is something they have to fix on their end.
It looks like their WoolCarpetRecipeSerializer isn't handling the CraftingInput.EMPTY case correctly.