I was desperate enough to go against the good advice of not mixing PureOS and Debian repositories and installed the newer versions of xdg-desktop-portal, xdg-desktop-portal-gtk, and flatpak from bullseye-backports. Installing the newer portal fixed another issue for me and enabled the installation and management of web applications in the flatpak version of GNOME Web. I removed my older web applications in the local version of Epiphany and added them anew with the flatpak version. There must be some side effects but I noticed only the good ones so far.
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