pgAdmin4 stopped working with VPN upon upgrade.

I run pgAdmin4 in an Ubuntu VM.
I connect to a PostgreSQL database running on AWS RDS.
To connect to RDS, I run an OpenVPN to AWS.
On my host OS, I run a VPN from my Windows virus software vendor for
general privacy.

All of this worked fine until today when I upgraded to pgAdmin4 5.6 using
*apt.*
Now I have to disconnect the VPN on my host OS.
With the host OS VPN up, expanding a table on the tree navigation (and
sometimes before I drill down that far) hangs.
I have to bring down the host OS VPN, and restart pgAdmin4 for it to start
working again.

I tried to find a way to downgrade pgAdmin4, but couldn't find how to do
this with *apt*. I tried to uninstall and then install specifying the
version, but I got this:

*~$* sudo apt install pgadmin4=5.5
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
pgadmin4 : Depends: pgadmin4-server (= 5.5) but 5.6 is to be installed
Depends: pgadmin4-desktop (= 5.5) but 5.6 is to be installed
Depends: pgadmin4-web (= 5.5) but 5.6 is to be installed
E: Unable to correct problems, you have held broken packages.

Can someone advise me?

I'm looking for either a way to downgrade pgAdmin using *apt*, or a way to
configure my connections in *pgAdmin4* to tolerate using my host OS VPN.