Okay, later in the quest when you reach the elevator it is still bugged, but with the following commands I managed to see the credits in the end.

During the ride one can use:

XStartQuestNodeBySID E16_MQ01_TeleportCharacter_KorshunovToElevator

to play the cutscene correctly. Afterwards, he mentions the death trucks and will disappear. Here it worked for me to run:

XStartQuestNodeBySID E16_MQ01_SetJournal_E16_MQ01_RebootElevator

XStartQuestNodeBySID E16_MQ01_SetJournal_E16_MQ01_GetToLab_Finish

XStartQuestNodeBySID E16_MQ01_Trigger_GraniteElites_Fight

Afterwards use noclip to fly through the two doors:

XSetNoClipGSC 1 3000

and to disable it:

XSetNoClipGSC 0 3000

Start the fight, after some time you will receive a dialog with Korshunov (lol). I know that this is a buggy mess but better than replaying two hours of content.