I am using GNOME on Bazzite. All of a sudden, starting yesterday, the KeePassXC Flatpak is no longer using Adwaita themed window decorations. It seems to be falling back to some default:
Other Qt based Flatpaks do not have this issue, e.g. Scribus, Kdenlive, and Haruna:
I tried reporting this issue on the GitHub page for the KeePassXC Flatpak and was told that this could be Flatpak KDE framework issue. I would appreciate some help diagnosing the problem so I know where to report it.