Chromecast on the Flatpak version hangs indefinitely

[ffoxD]

In the deb version of stremio, in my tests, Chromecast works fine.
However, on the Flatpak version of stremio, it does not.
I have tested in multiple distributions, and it never works.
It seems to hang indefinitely at the loading screen.
log.txt
Here is what it outputs upon being run in the terminal.
This has been an issue for a really long time.
Also look at flathub/com.stremio.Stremio#4