After upgrading a ceph cluster tonight, creating new images (qemu & lxc) creates volumes with object-map, deep-flatten and layering features enabled. This hinders the vm to start - with the message described above. Today I have upgraded ceph again (new update available) - but no result.
Any news on this?
https://bugzilla.proxmox.com/show_bug.cgi?id=1794 exactly describes the behavior we are experiencing.
I also have tried to limit the qm dump to 10MB/s (and later to 50 MB/s) but this only affects performance, not the error.