Comment 2 for bug 1973239

Please note that the above 'fix' doesn't fix the issue either. However, this seems to work

Unattended-Upgrade::Origins-Pattern {
      "origin=Raspberry Pi Foundation,codename=${distro_codename},label=Raspberry Pi Foundation";
};

I tried to add -security and -updates too, as in

Unattended-Upgrade::Origins-Pattern {
      "origin=Raspberry Pi Foundation,codename=${distro_codename},label=Raspberry Pi Foundation";
      "origin=Raspberry Pi Foundation,codename=${distro_codename}-security,label=Raspberry Pi Foundation";
      "origin=Raspberry Pi Foundation,codename=${distro_codename}-updates,label=Raspberry Pi Foundation";
};

but found no change on updated packages.

As mentioned, I don't know if this is relevant in regards to Bullseye, but I'll get back on that as soon as I can get my hands dirty on that.