We have a few changes, but none of these is "the" issue.
- Cpu features
- cpu model
- emulator without redirect

But I found that your nvram line is wrong:
  <nvram>/usr/share/AAVMF/AAVMF_VARS.fd</nvram>
With that you want it to change the systems default template, you should 
instead use
  <nvram 
template='/usr/share/AAVMF/AAVMF_CODE.fd'>/var/lib/libvirt/qemu/nvram/b1_VARS.fd</nvram>
With an individual guest name.

This misconfiguration is the problem that breaks it:
  error: internal error: cannot load AppArmor profile 
'libvirt-1f776433-dc84-43ac-9e60-b8e571ae22ff'

If anything the message is sort of misleading, but that is another issue
(see bug 1767934 for that).

For this bug here it is just misconfiguration, switching to my
suggestion above avoids the issue and make it work.

Note: The apparmor Deny messages are actually a Red Herring and no more
occurring in later versions.

** Changed in: libvirt (Ubuntu)
       Status: New => Invalid

** Changed in: apparmor (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1772538

Title:
  Can't start arm64 VM due to apparmor error.

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