The item filter doesn't seem to be working right now. Right click it in the air, drop some items into the filter slots, and exit the item filter interface with E or Escape. If I re-open it, the slots are empty. Looking at the NBT data, it's marking every slot as empty. When freshly crafted, there is no NBT data.

Every single slot is {empty:1b}. Now, I really hope I'm not doing something wrong (doubt it, this would be the way I'd interact with most similar items), but you know, I always leave open the possibility that the problem is me. :)

This is with MC 1.12.1, forge-14.22.0.2467, and RandomThings-MC1.12.1-4.0.5.jar. There are absolutely no errors or related messages in the logs.

Odd. I shall do so as soon as I get a chance, thanks.

Hmm it works fine for me, can you reproduce this with only RT installed?

I'm getting the same issue in Project Ozone 3.

Same in Direwolf 1.12 pack. Using vers 4.2.6

Project Ozone 3 Kappa mode, closed beta:
After opening the filter by right clicking in the air and placing a diamond nugget in manually, when I close it the diamond nugget is gone. Emerald nuggets work fine when placing them manually. The order in which I place both seems to make no difference. After reading Blibbo's comment I tried shift clicking them in and that worked fine.

I just had this problem on Project Ozone 3, looked all around the internet to find solutions and then saw you guys had this issue too, but I also noticed I previously accidentally put something and made nbt save for the item filter so I thought there was a way, and boi was it dumb. Just shift left click an item and it actually saved nbt for it, putting the item manually erases the nbt for some reason