Since Whonix 14 will be released very soon, this bug report will be rejected for Whonix 13.
https://forums.whonix.org/t/whonix-14-release-blockers-status-of-whonix-14-development
Could you try in Whonix 14 please?
And could you compare please with TBB inside a Debian template?
(as per Tor Browser Essentials)