The latest Proxmox release introduces a new Qemu machine version that seems to behave differently for how it addresses the virtual disk configuration.

Also, the regular “query-block” qmp command doesn’t list the created bitmaps as usual.

If the virtual machine version is set to “9.2+pve”, everything seems to work out of the box.

I’ve released Version 0.50 with some small changes so its compatible with the newer machine versions.