The error you’re seeing is related to this bug, which appears to be related to the latest flatpak package.
I worked around this problem by first downgrading to flatpak 1.8.2 and then used dnf versionlock add flatpak (which requires installing the python3-dnf-plugin-versionlock RPM package) to prevent dnf from upgrading to a newer version of flatpak.
I should note though if you use Gnome Software to install updates, it ignores the versionlock and will install the latest version of flatpak. So if you decided to downgrade and versionlock flatpak, you need to use dnf to install RPM updates until a fixed for this bug is available.