Initially I was planning on reporting this in v19.0.1 forum but as the the issue is still present in v19.5 EAP here is a good as place as any.
I have a static IPv6 address assigned to a W10 PC.
The VM running v7.3d also picks up the same IPv6 address.
I have edited the VM network and it is assigned its own static IPv6 address which is picks up as well as the w10 PCs IPv6 address.
Ian