The Vocal podcats app has been unmaintained for years. It uses deprecated runtimes and it simply does not work on any distro

This app seriously needs to be updated or removed from Flathub. It’s a shame too, because this is (was) the best podcast app on Linux in my opinion.

Fortunately, Arch Linux and Opensuse include a patched version in their repos that works pretty well, and the Opensuse rpm seems to work on Fedora. I just cannot understand how an app which simply does not work (crashes upon adding a podcast subscription) is allowed to be on flathub after years.

If you are talking about this app:

I merged the outstanding pull request to update the runtime.