We need to fix forum onion link anyway , some contributors wont even open the forum using TLS connection. So better fixing the forum onion link rather than changing it to clearnet.
Reporting in for the VirtualBox version, 6.0.16, Debian Buster host,
no problems noted, everything works, xfce menu display settings are working for me, no notice for security slider, but I am fine with that; I have the tor shield icon filled in anyway (and also about:config javascript.enabled, false and browser.urlbar.filter.javascript, false)