I can confirm that x2golistdesktops works without passing the -u parameter to ss. I changed the script /usr/bin/x2golistdesktops at line 68 from:

my $lines=ss -lxu; to my $lines=ss -lx;

And x2golistdesktops works fine and accessing a local desktop also works fine.

Thank you, Tancredi-Paul Grozav