I am using ATM7, and made a backpack, and eventually upgraded it to Netherite. I have been using it for a while now. Suddenly I launched the game and loaded in, pressing B is no longer opening the backpack. I tried dropping the backpack, picking it back up, and taking it out of the Baubles back slot, but nothing fixed the issue...

Versions
Forge 40.1.68
SB 1.18.2-3.18.17.680

Nevermind, it seems it was an error in the game at the time, a bunch of UI's would not open. I restarted the game and it is working now.