Packages from here: https://download.opensuse.org/history/20260511/tumbleweed/repo/oss/x86_64/ works.
Add this URI as repo (without last URI part - x86_64/), run Yast2, search for apparmor, select older version (4.x) for each package with apparmor- prefix, install, click continue/backward, set do not change (by right click and select given menu item) on each downgraded package, click ok.