This has been likely fixed by [1], thanks Andreas for the pointer. According to d/changelog [1] was first released in 4.6-2ubuntu1 (Eoan), so I'm marking this as Fix Released.
[1] https://git.launchpad.net/ubuntu/+source/squid/commit/?id=665afbf87f5d32d587445ff54de41ad79de2efde ** Changed in: squid3 (Ubuntu) Status: New => Fix Released ** Also affects: squid3 (Ubuntu Focal) Importance: Undecided Status: New ** Also affects: squid3 (Ubuntu Jammy) Importance: Undecided Status: New ** Also affects: squid3 (Ubuntu Impish) Importance: Undecided Status: New ** Changed in: squid3 (Ubuntu Focal) Status: New => Fix Released ** Changed in: squid3 (Ubuntu Impish) Status: New => Fix Released ** Changed in: squid3 (Ubuntu Jammy) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Server/Client Support Team, which is subscribed to squid3 in Ubuntu. Matching subscriptions: Ubuntu Server/Client Support Team https://bugs.launchpad.net/bugs/1787409 Title: apparmor profile incorrect for squidguard usage To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/squid3/+bug/1787409/+subscriptions -- Mailing list: https://launchpad.net/~enterprise-support Post to : [email protected] Unsubscribe : https://launchpad.net/~enterprise-support More help : https://help.launchpad.net/ListHelp

