I have installed google-chrome via Google's own repository. It works and everything is fine. But recently realised that it does not show up as installed in Discover. Searching for google-chrome, chrome or "google chrome" only shoes two different flatpak versions. It does appear in Synaptic, the repository is also show correctly in the list of repositories. While I am writing this, I am noticing that the same problem exists with Firefox. I have installed the deb-version, which appears installed correctly in synaptic but is not all listed in Discover.