Problem with delanuay2D

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Problem with delanuay2D

Hi all,
I'm using delaunay2D to generate triangles from point data, and in most of
the cases works perfectly fine. But in case that my input points happened to
be in regular lattice (like structured points) for some reason Delaunay2D
output is wrong, one triangle in the corner is missing. See attached image,
I don't see any reason not to create triangle in that corner, because
neighborhood cells are using the same points.
Any idea is welcome


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