How to remove a sticker from a photo?

From time to time, I accidentally trigger the creation of a 'sticker' by holding my finger on the subject of a photo (as described in this Apple user guide). This can be pretty annoying, but it's worse than annoying if you happen to do it in the Files app, because if you then move your finger, it duplicates the subject and plonks it down right over the top of your original photo!

It seems that you have one brief chance to undo this, by tapping on the tiny blue ellipsis button and selecting 'Delete'. However, the first time I did this, I didn't know what to do and now the photo is ruined by having this 'sticker' on it permanently. I could find no way to undo this action or restore the photo to its original version, nor can I find any online instructions on how to remove it.

The sticker does appear to exist on a separate layer because if I touch and hold the original subject, it creates yet another complete duplicate of it, despite the fact that the first sticker is obscuring part of it. When you do this, the original photo is darkened, making both stickers stand out from the background. However, in this state, there still seems to be no way to select or delete the first sticker.

Given that the sticker is on a separate layer, one would imagine there has to be some way to remove it. Does anyone know of a way?