I got same problems. But seems in the weekend something changed and feeling like they fixed it.

Thanks for your report tripnmonkey ! "Unknown' is indeed misleading. Here it means in your case that the chainhooks are not there anymore (error 404). I will investigate further and check what happened. Meanwhile you can still re-create the same chainhook by clicking on the 3 dots on the right and select 'Edit' and update the chainhook. It will be recreated with the same config.