if you do not specify the size (efitype), then a partition of only 128kb is created
through the GUI does not suit me
qm set 300 --efidisk0 local:0
update VM 300: -efidisk0 local:0
Formatting '/var/lib/vz/images/300/vm-300-disk-2.raw', fmt=raw size=131072
transferred 0.0 B of 128.0 KiB (0.00%)...