Interesting. Bottles is usually my go to for Battle.net. I hadn't played any Battle.net games in probably a year now when I switched over to PopOs 24.04. I wonder what's going on. I do remember all of your tools needed to have the same flatpak version installed as the bottles version you are running, at least it seemed. Usually not an issue on first install, more like, when you upgrade one tool but not the others. Well, no biggie, at least you have a working install; all that matters.