Unable to Tessellate shape. Possible malformed shape detected

Why is this polygon judged to be a self-intersecting figure?
If it is the accuracy problem that causes the judgment to be self-intersecting, how can I make the judgment during storage, or please tell me what is the accuracy of the self-intersecting graphics?
Because I don't know why the ES database judged this polygon to be self-intersecting, I don't know what to do with it.

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