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You can do a dry run of creating a data volume with that vmimage, it should have

metadata.ownerReference

on the data volume and on vmimage it should have list of so remove the ownerReference from the data volume, then the finalizer who watches on remove and see what happens with the object - data volume (you can create it through vm creation as well) If everything is alright you can proceed with all other volumes the same way, after which you can delete the finalizer from the

metadata.finalizers

and re-create, but keep in mind this is hackery and we have no documentation for it so can't predict how it all comes together that's why I suggested dry run. Also after that not sure if the data volumes would have the owner reference, I think no controller will detect on vmimage creation the objects lacking owner references so keep that in mind.