I get a message like below updating flatpak on Linux Mint. The update does work.
flatpak update com.calibre_ebook.calibre
Looking for updates…
ID Branch Op Remote Download
- [—] org.freedesktop.Platform.Locale 25.08 i flathub 1.0 kB / 379.1 MB
Installing… ████████████████████ 100%
(flatpak update:301822): GLib-GIO-CRITICAL **: 10:06:51.349: g_file_get_child: assertion ‘!g_path_is_absolute (name)’ failed
(flatpak update:301822): GLib-GIO-CRITICAL **: 10:06:51.350: g_file_query_info: assertion ‘G_IS_FILE (file)’ failed
ID Branch Op Remote Download
- [✗] org.freedesktop.Platform.Locale 25.08 i flathub 1.0 kB / 379.1 MB
Warning: (internal error, please report)
Installation complete.