I know this is two years later, but I encountered this issue as well. I'm a chronic over-saver, though, and after reading through the patch notes linked here, I reloaded and ensured I didn't click anything before the door's scripted opening, which seemed to work. I didn't think I'd clicked on anything the first time, but who knows; regardless, reloading the save and waiting for the door to open on its own successfully triggered the cutscene.
If anyone else encounters this issue, I hope this response helps.