(resent using what I think you have as my email address used in From: header)

I posted an issue on XFCE, using XFCE with X2GO

https://gitlab.xfce.org/xfce/xfwm4/-/issues/678#note_59619

My reading is that :

    /usr/lib/x86_64-linux-gnu/libwnck-3.so.0  (version 43.0-*)

Is implicated