Migration progress percentage not showing

[alet]

I came from a 3.X proxmox installation where when i did VM migrations between cluster's node i saw a live migration percentage like:

[....]
starting migration of VM xxx to node 'xxx'
copying disk images
vm-xxx-disk-1.raw
rsync status: 32768 0% 0.00kB/s 0:00:00
rsync status: 383713280 1% 84.13MB/s 0:06:34
rsync status: 728367104 2% 82.21MB/s 0:06:39
rsync status: 1067155456 3% 80.83MB/s 0:06:42
rsync status: 1408925696 4% 81.53MB/s 0:06:34
rsync status: 1788182528 5% 90.47MB/s 0:05:51
rsync status: 2086141952 6% 94.89MB/s 0:05:32
rsync status: 2442461184 7% 85.02MB/s 0:06:06
[...]

Now i have a new 2 node cluster on a 6.X proxmox installation and when i do a VM migration between cluster's node i see start notice and i have to wait without any kind of progression information. After a while (some minutes) the migrations end successfully.
In this case i only see this during the migration of the VM:

- starting migration of VM XXX to node 'XXX'
- found local disk 'local:XXX/vm-XXX-disk-0.raw' (in current VM config)
- copying local disk images
- Formatting '/var/lib/vz/images/XXX/vm-XXX-disk-0.raw', fmt=raw size=128849018880

The only difference between the clusters configurations are the verison the old one was 3.x (the new one is 6.x)
And the old ones had ext4 filesystem where the new cluster have ZFS storage only.

How to show the progression percentage info about the status of the migration?
Why the progression percentage info IS MISSING?

Thank you in advance