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For backwards compatibility, osbuild-composer wants to explicitly select qcow2 v2, rather than the default v3 when building qcow2 images for RHEL8.4. This is what was done in RHEL8.3 (before osbuild-composer was used) and ensures compatibility with RHEL6 hosts.

Extend the osbuild manifest format to allow explicit selection of the qcow2 version.

I see:
$ qemu-img info rhel-guest-image-8.4-754.x86_64.qcow2 
image: rhel-guest-image-8.4-754.x86_64.qcow2
file format: qcow2
virtual size: 10 GiB (10737418240 bytes)
disk size: 684 MiB
cluster_size: 65536
Format specific information:
    compat: 1.1
    compression type: zlib
    lazy refcounts: false
    refcount bits: 16
    corrupt: false

I expect:
$ qemu-img info rhel-guest-image-8.4-754.x86_64.qcow2 
image: rhel-guest-image-8.4-754.x86_64.qcow2 
file format: qcow2
virtual size: 10 GiB (10737418240 bytes)
disk size: 1.24 GiB
cluster_size: 65536
Format specific information:
    compat: 0.10
    compression type: zlib
    refcount bits: 16

Proposed PR to add the needed option to the qemu-img command in osbuild: https://github.com/osbuild/osbuild/pull/629

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (osbuild bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1825