It did used to work, not after latest update.

plane = new Plane(mat, 500, 500);
scene.addChild(plane)

var subGeometry:SubGeometry =
SubGeometry(Mesh(plane).geometry.subGeometries[0]).clone();
Mesh(plane).geometry.addSubGeometry(subGeometry);
Mesh(plane).subMeshes[1].material = mat2;

JUst put something like
if (_secondaryUvs)    clone.updateSecondaryUVData(_secondaryUvs.concat());

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