Have you tried removing and re-adding the 6.9.0 runtime from the Mendix Service Console 4.4.0?
In your application deployment directory <path>\Apps\<app name>\Project\web they should be a symbolic link to the mxclientsystem folder. Look at properties of this link and confirm that it points to the correct runtime version <path>\Servers\6.9.0\runtime\mxclientsystem
It looks like you are running the old web client (6.6) in production against a deployment package created by version 6.9. The error message you mention (unknown action type
) does not exist in Mendix 6.9. So, I do not think this is a bug in 6.9 but rather I think that the production server is serving the old version of the web client still. Someone with experience with the service console can probably quickly tell you how to fix this.
If any action fails it looks like a new bug was introduced, did you file a support ticket? Does the same happen in a brand new project? Or when running this project on your local machine?