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My mesh shows what looks like a bogus face normal. The mesh and screen cap show the problem. Some holes still show a face normal but no face can be selected!

I got to this point by creating a building mesh and merging vertices. I created a separate mesh (plane) for cutting holes in the building. I used knife project to put cut lines into the building. Then I selected and removed faces where holes should be. Some holes still show a face normal even though there is a hole (no face can be selected). Merging vertices does nothing.

This appears to be a problem, but I don't know if it causes anything bad.

[("https://i.sstatic.net/A9hFq.jpg)

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    $\begingroup$ I understand that the normal will show based on the median position of the face. This means you may have the normal 'coming out from a hole'. If you merged verticies (make sure you have the object selected) then also try Mesh > Clean up > Delete Loose $\endgroup$
    – barkest
    Commented Aug 15, 2019 at 14:56

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Barkest has the answer, I believe. The "bogus" faces have surrounding real faces whose medium centers just happen to be over a hole, giving the false impression that there is a face where a hole exists.

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