This has been implemented 4 months ago.
whonix-base-files/etc/qubes/protected-files.d/whonix-base-files.conf at master · Whonix/whonix-base-files · GitHub
But still not fixed.
sudo apt install --reinstall whonix-base-files
*** OMINOUS WARNING ***: /etc/hosts is not linked to either hosts.whonix or hosts.whonix-orig