Please uninstall all RPMs that you installed for flatpak support and install them again on your phone. Do not mess with /usr/XXX files manually unless you develop something and know what are you doing. Copying the files from one device to another should not be needed
flatpak remove org.kde.mobile.angelfish devel-su pkcon remove flatpak-runner devel-su pkcon refresh
devel-su pkcon install flatpak-runner flatpak-runner ^c
flatpak install --user org.kde.mobile.angelfish flatpak-runner ^c flatpak-runner org.kde.mobile.angelfish
bwrap: Can't mount devpts on /newroot/dev/pts: Operation not permitted error: ldconfig failed, exit status 256