Hmm,
I thought that is conceptually this way, from the man page of e.g. virsh:

"--copy-storage-all indicates migration with non-shared storage with
full disk copy ...  In both cases the disk images have to exist on
destination host, the --copy-storage-* options only tell libvirt to
transfer data from the images on source host to the images found at the
same place on the destination host."

This was later improved to work "a bit better" in some cases, and that is the 
patch series
  https://listman.redhat.com/archives/libvir-list/2020-January/msg01356.html
That the referenced bugzilla refers to.

That patch series is in v6.1.0 and thereby released in Ubuntu >=20.10
which has v6.6.0.

I'm a bit unsure if we should backport this to Focal as it is:
a) AFAIK not a regression more like a new feature
b) the functionality is available in Ubuntu (Groovy and later)
c) If needed for the LTS there also is [1] which some prefer to a full upgrade 
to a non LTS
d) I haven't looked at the patches yet, but seeing that it is quite a few of 
them there will certainly be some churn and risk to add them.

To be clear I'm not saying this is undoable, I'm saying maybe the risk 
outweights the benefit here.
On the positive side, this is from v6.1.0 so there should not be too much noise 
compared to things that got added later.

I think to give this a chance someone will need to make a compelling
case why this, being somewhat of a new feature and the option to upgrade
being available will still apply to be a valid SRU [2] under all the SRU
rules.

[1]: https://launchpad.net/~canonical-server/+archive/ubuntu/server-backports
[2]: https://wiki.ubuntu.com/StableReleaseUpdates

** Also affects: libvirt (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: libvirt (Ubuntu)
       Status: Confirmed => Fix Released

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

** Changed in: libvirt (Ubuntu Focal)
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/1929202

Title:
  [Ubuntu 20.04] Libvirtd will not pre-create images on the target host
  during migration

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