hi cartman, i thing i get the some issue.
Indoor handle isn't working when open , but outdoor working fine.
You have resolved it ?
The door catch has 2 (3 if you include the inner handle lock rocker) separate mechanisms for the outer and inner handles so its quite probable that only one has failed although it is usually the outer door handle that does go.
It might still be something as simple as a rod that has come off or a simple lube.