i upgraded to the latest version this month and noticed that my configs have changed, previously there were some collections setup under the "\data \fancydrop.json" file it had all sorts of stuff in there and i just made a new section called "mining_ore" (think someone give me the idea in the help here years ago) and this basically added in the occasional mining quarry and charges, but unfortunately this config doesnt seem to work anymore. I dont want to create an entirely new loot table, just want to add some extras to what exists normally, any ideas?

You need to read the update notes. All this was explained in the update notes.