Instance settings lost after snapshot rollback

[pdiego98]

problem

When a snapshot is created and then rolled back, the instance settings are lost.
In our case after restore rootDiskController, nicAdapter, io.policy, nic.multiqueue.number and iothreads settings disappeared.
We have reproduced the issue in two separete ACS, one at version 4.22.0.0 and one at 4.22.0.1.

versions

Our setup is
ACS 4.22.0.0 or 4.22.0.1 on Ubuntu 22.04.
KVM hosts with qemu 9.1.0-15.el9_6.7.x86_64 and
Local XFS storage

The steps to reproduce the bug

1. Create an instance, the problem is for both instances created with a template containing the custom setting and instances with additional setting added after creation.
2. If not already present from template, add some settings to instance like root disk controller type or nicadapter type
3. Create a snapshot of the instance
4. Rollback the snapshot
5. Check for the additional setting, they should be gone

What to do about it?

No response

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