Can someone please explain me why the following code doesn't result in a fill?

And why, sometimes, I get such "very thin lines" artifact (that's visibile in my picture)?

\node (A) at (0,0) {A};
\node (B) at (1,0) {B};
\node (C) at (1,1) {C};
\fill[red] (A) -- (B) -- (C) --cycle;

Here's what I get:


As pointed here, nodes have a shape and are not just pure coordinate. Your example works if you replace the fill line by real node coordinates:

\fill[red] (A.center) -- (B.center) -- (C.center) -- cycle; 


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