Config File Persistence Issues with Flatpak Installed Apps

I downloaded KRDC, and I find that any changes I make to the krdcrc file at /home/<user>/var/app/org.kde.krdc/config/krdcrc are constantly being reset back to the default config

I've noticed this with config files for other paks I've downloaded.

Is this the expected behavior, or a bug? I assume userspace is safe, but if not, should I be looking elsewhere in the file system for persistence config files?
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