This approach isn’t entirely foolproof since I can’t use a wildcard, and I don’t know how many disks will be attached to the VM. For now, it will never exceed two disks, so I can explicitly include both in the ignore_changes statement. That’s an acceptable solution for us. Thanks for your support.

Can you share how you created the template? And copy here the template object from xo-cli or the rest api: xo-cli list-objects type=VM-template id=<your_template_id>?

Indeed, and it's clearly stated at https://docs.xen-orchestra.com/community