I want to like Pinta, but some of the load/save behaviors are just weird... not sure if I last tried the Flatpak version or not, but I've tried it on both Mac and Linux a few times... It's my go to for quick edits, but far from a fav.
I tried Pinta, and honestly it has so many subtle differences from PDN, it was really uncomfortable and unproductive for me. I could not get to like it, but will give it some more time.
Also the icons are terrible (at least on the mac), I find it really hard to identify a tool, these monochrome icons set me off and slowed me down since Visual Studio 2012. This fad is a really good example for design trends ruining productivity.