This has come up a few times, the one I remember being a lot more recent than Jan 2023, so probably not the one you are looking for.
But to find the one you want, we need more details or scenes.
I remember reading a HP fic last January where Harry was removed from the Dursleys and one result was that Lily's protection was actively attacking Tom's? soul fragment in Harry's scar. It was prevented from doing so because of the way Dumbledore anchored the blood wards at Privet Drive.
