My favorite little one-shot I ever wrote involved Bruce walking between timelines on his way back from the dead in Grant Morrison's continuity where that's a thing that happens. I wrote it before I read the last bit, and of course the last bit didn't go anything like how I wrote it (well, it wouldn't have in the first place because of the shipping overtones I put in my version). I remember a LOT of Avengers fic written just before the first movie got very badly Jossed (literally!) and it's a big reason why I don't find fanfiction interesting anymore, unless it's for video game fandoms because that's all about personal headcanon.
In my original fiction writing, I make the story so it happens less, but there still have been times where the version of a scene in my head is jossed by continuity I had previously planned.
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In my original fiction writing, I make the story so it happens less, but there still have been times where the version of a scene in my head is jossed by continuity I had previously planned.