given that your PVE config now grabs a static address, this DHCP binding doesn't actually matter and could be deleted
According to a
google search, this router seems to be problematic in terms of isolation... See
here and
here for possible locations of relevant settings in the router configuration, but as the google search suggests, they may not actually solve your issue.
Perhaps also relevant to ask - do you have any other devices on your network that can currently access each other as they are supposed to, e.g. a network-connected printer, network-attached storage, or file sharing between your desktop and laptop?
If this is an inherent router limitation, your only solution would be to put the router in bridge mode and add your own (fully-configurable) router downstream.
