Oh God, the Jak and Daxter one for me was the most scarring, but I hate Bethesda games inherently because of their bugs.
I’ve lost a collective 150+ hours in Fallout 3 due to two very specific and odd bugs.
The first time, I had since played Resident Evil 4. That game made me paranoid and I started closing every door behind me. So I’m going for what I believe is the Science bobblehead in Vault 86 or so. I close the vault door behind me as I didn’t know if something could come for me. This is a process of pressing the button and running inside.
I go through the whole vault (3 floors) and come back. Look around for the button to open the vault door. No button.
I read online that every vault has a button to open the vault door from the inside except this vault for no apparent reason. 3 floors means autosaves covered my last good save (I believe you get 3 autosaves then it overwrites, memory is fuzzy).
So I’m stuck in this vault for eternity. Great. You’d think I would’ve learned my lesson, but no.
Second playthrough going for 100%, I was getting the EDEN device. I brought the mutant. I was following an online guide for 100% completion. I needed two more bobbleheads. I read the guide as I went and realize this is the end-game point, so I think “Ok, I’ll leave the mutant here and go do my stuff then come back and get the EDEN from him to trigger the end-game sequence.”
So I spend 20 hours collecting stuff. Then I come back to the place, and the door to the EDEN room is unopenable. The mutant is gone. There is no way to get the device, and so no way to finish the game. Autosaves galore by then, and I didn’t manually save.
Why Bethesda wouldn’t leave the NPC there, IDK. He didn’t spawn with me when I fast traveled or entered/exited places but was still my companion since I couldn’t recruit anyone else. Maybe he died due to radiation as I don’t think Mutants are 100% immune and I left him there for ages (probably not).
On one hand, both are things I intentionally triggered. On the other, I feel like a vault missing something all the other vaults have without a lore reason given is a bug. I also think Bethesda could’ve asked themselves “Ok, what if they send this guy in and then leave the vault without getting the EDEN device from him?” pretty easily. Having someone play test the game shouldn’t be required for basic logical questions like that.