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Not at all, a little closer to the answer,, definitely cut into the rock, this is what came up when used google lensIf you took the rock on the right and laid it horizontal, there is then a flat top and bottom, and what looks like a part to fit together with another stone. Think along the lines of tongue-in-grove wood.
Kinda like this (apologies for my poor drawing skills):
View attachment 2179673
That, or it's just my pareidolia kicking in. View attachment 2179676