Within a snapshot world I've been working on, I tried to implement a loot table that I can put into chests. The issue is purely with the parsing, and I successfully produced the intended results inside another world using 1.16.4, but once I switched the version back to the latest version of the snapshot the same error was thrown.

I've looked over the change logs for the snapshots and haven't been able to find any solution/reason as to why this isn't working. I will attach the datapack I used to test the bug, as well as a screenshot of the thrown error.