Custom Item Invisible on Ground Again After Problem Already Solved

[BombardmentPigs]

Hello,
I have previously encountered a problem where a custom item I made was invisible when dropped on the ground. I can pick it back up but I can't hover over it, it appears to not have a hitbox. This problem was solved after I found out the names inside the .scml files were incorrect, and after renaming them the items worked fine.
This was the previous post:

However, recently, I have been using the same mod, and the items have begun disappearing on the ground again, with the exact same problem. I checked the .scml files and their names were correct, so I do not know why this is happening again. I have tried updating the mod multiple times and checking the spelling of the names, and the problem is still there. Even stranger, when I copied the code and files for a new mod, and renamed everything, the same problem did not occur on the new version. The code and everything on the new version remained completely untouched except for the renaming.
Any help would be appreciated!