What I found odd about your “reveal” was that not only the “temple” was missing but the arrow persisted.
It’s not layers. I am not totally fluent with the tool, but I think it shows pixels that are out of place based on lighting. Thus the arrow was out of place, and appeared so on the fotoforensics analysis. The temple looked ok, to me.
The odd thing, as I noted upthread, was that in the ‘clean’ photo without the temple, the pixelation of the sky seemed off. I want to go back and closely look at the two photos, in my copious free time.