I’m about to impart a piece of forbidden sock knitting wisdom. I learned this from my mom, who I think learned it from her mom, who in turn was a soft-spoken and resourceful refugee from Karelia.
You can fix holes by just going through them with a bit of yarn and a crochet needle. You know: you finish a heel turn, congratulate yourself as you start picking up the stitches, and then there’s That Gap.
My advice: leave it be. Don’t tink, don’t pick up extra stitches, don’t Google and/or sacrifice to the old gods. Leave it be, and once you finish just go through the area with some spare yarn. Loop through the loose stitches on the flip side, tighten, tie a knot. Ta-da. The gap is gone.
Or, in my mom’s words: if no one can find your sins, they don’t exist.