When I edit the config, it is automatically reset to the original text file after running minecraft. The changes are saved, but the file is overwritten after every run. Possible bug?

I edited the configs in-game, and it still ignores them. I disabled those will-o-wisps, and still see them.

I've same issue with the will-o-wisp, they still spawn from soul lanterns even if I disabled it. I don't know if this is related to original issue though.