xdg-open: can't open persistent directories from $HOME

Trying to open a persistent directory (specified in `--persist=`) from within a flatpak (that has no real homedir access) with `xdg-open $HOME/<directory>` does nothing, although `echo $?` prints 0. It this expected behaviour?

Actually, I expected it to be equivalent to `xdg-open $HOME/.var/app/<app-id>/<directory>` in this case.

