I died from drowning in the Abyss. Now using a Gills Potion causes me to start losing oxygen.

[rapid flare]

An example of the Gills bug in action.

Basically, the moment I enter 'regular' water (i.e. not the Abyss), my oxygen immediately fills back up.
Then when I leave the water it goes back to being bugged.

[empty tangle]

this is a vanilla feature in fortheworthy and getfixedboi

you will drown in air with gills effects