We have been using Keycloak since version 8, along with customized themes from that time. We successfully upgraded to version 15 without any issues years ago and are currently running version 22.x.
Regarding the themes, we have typically copied the entire themes folder over to each new Keycloak installation during upgrades. The only complication this approach caused over the years was that the default theme folders were no longer included, as we only copied our custom themes during upgrades.
However, as we now attempt to upgrade to the latest Keycloak version, we are encountering the following error when trying to load the Admin Console UI:
{{notification.header}} {{notification.message}}
Loading...
From what I can gather, the new version seems to reference an older template file from one of the default themes that are no longer available. My question is: should we start using the new default theme folders again, or is there a workaround to avoid this issue?