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Hi, did you ever sort this out? We are running into the same issues with ubuntu 20.04 and only workaround sofar is to set "critical: true" for the interface in netplan to make networkd stop doing the DHCPRELEASE when the service stops.
Just for record purposes - I found the problem to be poorly configured switches and IP telephones that were not moving to the correct VLAN and seem to have been requesting IPs for a different VLAN and the caused the error.