Joe, I still can't reproduce your issue.
Can you please verify against what I'm trying:
1. Setup a VPN that provides DNS via DHCP
2. Connect to that VPN and verify DNS by:
$ systemd-resolve --status
(...)
Link 4 (tun0)
(...)
DNS Servers: X.X.X.X
(...)
3. Disconnect VPN and edit connection:
$ nmcli connection edit myvpn
nmcli> set ipv4.dns-priority -30
nmcli> save
$ nmcli connection show myvpn | grep dns-priority
ipv4.dns-priority:                      -30
ipv6.dns-priority:                      0

4. Re-connect to VPN and try to reach a name within the VPN:
$ dig some.host.in.my.vpn

I have used:
$ apt-cache policy network-manager
network-manager:
  Installed: 1.10.6-2ubuntu1.2

Please tell me in which of the steps in your case network-manager
behaves differently.

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https://bugs.launchpad.net/bugs/1851407

Title:
  NetworkManager 1.10.6-2ubuntu1.2 breaks VPN DNS

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