Plotting $2^x+2^y=2^x$ on Desmos

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When I plot $2^x+2^y=2^x$ on Desmos, I get this graph: enter image description here

But I think it should not plot anything at all, since $2^y=0$ does not have a solution for $y$.

Can someone guess what happened on Desmos's side? Or is it something only the developers know?