Ny way to fix missing quest NPCs in Cyberpunk 2077

I'm currently trying to overcome a game-breaking bug in my Cyberpunk 2077 (PC, Steam) save file that has broken the main quest for me, and was wondering if anyone had found a fix or workaround for these types of bugs in this game, or other ideas I could try. (Important note: This bug occurred after installing the Day One Patch.)

The problem

I'm on the mission "The Heist", at the objective after you put on the suit where you're supposed to get into Delamain, the car that Dex got for you. The problem is that Delamain is missing. Jackie is leaning up against thin air, I can walk right through the spot where Delamain is supposed to be, and I haven't been able to get the interaction prompt for getting into the car to appear, despite the objective marker still showing up and floating in midair. I remember that when I first got here, the car was here, but now after doing some sidequests and coming back to it later, it's just gone and I can't get it to reappear.

Because of this bug, the main quest is broken and I can't continue the game.

Things I've tried

I have tried:

• Restarting the game and reloading the save multiple times.
• Fast traveling to different places to "unload" the area, then fast traveling back. This reloaded other objects, but didn't load in the car.
• Waiting for several days' worth of in-game time.
• Putting objects and corpses into the area where the car is supposed to be, in the hopes that it would realize the car wasn't there. (No dice.)
• Calling Delamain on the phone.
• Taking off the quest item suit and putting it back on again, to change the objective marker.

None of it worked. I don't have any saves that were long enough ago to fix this, and really don't want to have to restart my game or just do sidequests forever, but it seems I might have no choice. I also really don't want to have to uninstall and reinstall the game, since it's absolutely huge.

Are there any known fixes for an "NPC didn't spawn" bug in the game, and/or potential solutions?

(My setup specs, in case it is relevant: PC Steam copy, NVIDIA GeForce GTX 1050 Ti, Intel i7, Asus Rog Strix 17 GL703GE.)