After looking in the logs, I think I know what’s going on, and it matches an issue reported a while ago (August 2023)
Basically, we still are relying on parameters that get automatically filled when using the Azure DevOps Extension instead of relying on the binding. The ticket to rely on the data from the binding is still open. I know it’s something we plan to work on sooner than later.
For now, you can pass those additional three parameters and you should have PR decoration working.