prints "This tool has been deprecated, use 'gio open' instead. See 'gio help open' for more info."
I just realized that this is the output of xdg-open:
However xdg-open calls
which at least opens the directory so it is definitively a fault of xdg-open.
However I decided to post since you may want to hotfix it before xdg-open fixes it.
After further investigations I found out that the call still works on files. However on directories the call randomly silently fails.