Agent Workspace shows a blank page when opening a record. A console error can be seen when opening the browser console. The error points to a UI Policy or Script on that table.
Release or Environment
There is a UI Policy or Client Script which errors on form load and prevents the form from loading
To solve the issue, look at the console error to identify if the error comes from a policy or script. Usually, there will be a sys_id referenced in the error, this will be the sys_id of the policy or script in question. Locate and review the policy or script for any issues by ruling out parts of it.
One example that I saw was that the condition on the UI Policy was pointing to records that no longer existed on the system. I was able to find this because removing the condition fixed the issue.