The devs just released a new version that fixed the issue. When use Freetube, you have to be ready for Google fucking everything up and then the Freetube devs working to fix it.

It's literally a game of cat and mouse.

On a slightly related side note. I would hazard a guest that people who use Freetube, Invidious, Newpipe, etc make up like at most 5% of people who use Youtube. I am being very generous with the 5%. Google will do anything to make sure that they maximize profits.