Potential Issue with Realm of Light III

I'm picking up the game again for the first time in a while and I'm working on my level 82 mage. I noticed that I had started this quest but I didn't finish it last time, leaving off on a step somewhere inside the castle but when I attempted to continue the question, the castle door is not open. (I cannot include an image because I haven't made enough posts yet lol, but its just the door at Castle Dullahan which is closed.)

I have checked the wiki and this is the correct door; is there a way to reset the quest like with the Aldorei or is there another way inside? I would think there would be some sort of soft lock protection for quests like this one, especially given how important it is.

Also I'm genuinely unsure whether to ask this in 'Questions' or 'Bug Reports' because I'm unsure if this is a bug or not. However, to make sure it is a question: is there more soft lock prevention other than /fixquests? If so: how do they work/how can people access them? If not: why not? what's preventing more anti-soft lock function?

Edit: I'm on the "Leave the room and continue exploring the castle" step, which you would normally not be able to leave the castle during. I have 0 clue how I've managed this lmao.

 

I'm in the same boat, stuck on the same part i'm not in the castle and not sure how to continue