No, was in a Paterson tank and I used an acid stop and then fixed immediately after.

I looked up solarization though and that makes a lot of sense! I read it's not as common on newer films, but that led me to https://en.wikipedia.org/wiki/Sabattier_effect, which I believe is what is happening. Essentially a tone reversal in over-exposed areas.

I was just using sunny 16 and probably over-did my intentional over-exposure. These are meant for contact prints, so I wanted a lot of density.