UPDATE
in new whonix release virtualbox Guest Additions also get updated
virtualbox-guest-utils
virtualbox-guest-x11
virtualbox-guest-dkms
now problem is in 6.1.6* additions
whenever i downgrade to 6.1.4 it work great each and everything
and same when i upgrade to 6.1.8 everything is smooth
so problem is in 6.1.6 additions
@Patrick