Drowned Drop Gold Ingots Instead of Copper Ingots

Whilst working underwater, A Drowned equipped with and Unbreaking 1 Trident (It dropped the Trident upon death; I had already picked it up) spawned. I hit it twice, the second time into an air pocket i had drained. It died of fall damage and dropped both the Trident and a gold ingot. This was on a private server in a vanilla survival world. The posts generated for similar issues were not specific enough so I decided to make this a separate submission since i had a screenshot and memory of the conditions of when it happened. Edit: after doing a bit more research, some of the Vanilla Tweaks datapacks have not been updated to the correct version, I apologize for any inconvenience.