You’ve seen this, right? Anonymizing your MAC address
And you researched my comment before you replied, right? For example, you’ve seen this: anonymize MAC: update for 4.1 · 12fe6519e3 - Git-Mirrors/Qubes-Community-Content - Forgejo: Beyond coding. We forge.
Are you saying that that isn’t working on your system? It’s working on mine (both the default, and also the manual modification to sys-net, for example for wired eithernet).