You might be right in that respect. It’s not a time travel story but for context, here’s some of the broad details.
The beginning of chapter 1 sorta goes from where canon ended to where the characters are now. For those purposes, I gloss over a fair amount of details about the things which happened in between canon and the story. Just enough to make chapter 1 work. However, later in chapter 1, something happens which probably needs an explanation. But the detour would be too much for the first chapter. Although the way I have it structured, that detail doesn’t get filled in until chapter 3 which is focused on the character it happens to.
In between, chapter 2 fills in more of the details on what gets glossed over in chapter 1. I think readers of the fandom would understand why the details need to be filled in. The character who something happens to is different in certain ways from canon. But I’m putting in the work to explain it.