Depicting of Atom Labels render-output-format emf

Atom labels have a solid colored background when depicting molecules using render-output-format emf and molecule has super atoms, or alias atoms or polymer brackets:

MolId:= indigoLoadMoleculeFromFile('Superatom.mol');
indigoSetOption("render-base-color", "1, 1, 1");
indigoSetOption('render-output-format','emf');
indigoRenderToFile(MolId, 'Molecule.emf');
//canvas has black background
canvas.Draw('Molecule.emf');