Keycloak 19.0.1 admin console inaccessible in kubernetes

[sbrawner]

Using the same configuration that works properly for 18.0.2, I am unable to access the admin console via kubectl port-forward --namespace keycloak-test $(kubectl get pod --namespace keycloak-test --selector="app=keycloak" --output jsonpath='{.items[0].metadata.name}') 8080:8080 8443:8443 using either 8080 or 8443. I can access the landing page (Welcome to Keycloak page with the link to the admin console) but when I click the administration console link I get a blank page. Looking in the developer's console/network tab with Chrome shows 200's all the way down with a single issue

The page will attempt to reload after a few seconds but never completely load.

Using 19.0.1 production mode with PSQL. This not an upgrade and is using a GCloud fresh db with the cloud-sql-proxy and correct service account credentials (this configuration works properly in our production instance 18.0.2). The proxy and the keycloak container are both able to connect to the postgres db.

Any help is very much appreciated.

[sbrawner]

Switching off strict https checking and making the cache local has temporarily fixed the issue, but I want to know what's going on to break it.