I also ran into this issue. Running KMRP, K1CP and K1CP Starmap Hotfix, even.
I had the issue, reloaded saved before I opened the door, still had the issue. Loaded save entering the ruins and did it all again, still had the issue. That time I saved in the main room before opening the door before the door that triggers the cutscene, still had the issue. Reloaded multiple times, issue every time.
Then I quit out and restarted the game. It worked from that quicksave without doing anything differently.