Certain loot tables not working

I'm on 1.16.5 MCreator 2021.1 and I'm trying to make a chest have a loot table I made with a command block, and it would just not work. So I made a test one with like a million sponges and when I try that one it works. The actual loot table is picking one of the custom music discs I made for this mod and a few other items. Why wouldn't it work?