Do indent lines always show up on inverted pictures?

LauraBeth

I took this photo a couple days ago and you can see a faint line on the inverted picture. I’ve never inverted a photo before. I chose to after noticing what looked like the start of a line on my regular photo.

I’ve taken 2 more tests and I can barely see the line on them as well. Does that normally show up when you invert a picture, like where the line would be? Would it just be an indent line?