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It is because of Texture's alpha is not dilated for the gap.
Details could be found HOWTO-alphamaps

So how to fix it:

• if it's in your Unity project, just enable this texture's AlphaIsTransparency in Texture Importing Setting inspector.

public static void DilateTexture()
{
    if (Selection.activeObject == null)
    {
        if (EditorUtility.DisplayDialog("Error Selection", "Select a texture", "OK"))
        {
            return;
        }