BRepFilletAPI_MakeFillet bug for OCCT DEVELOPERS

Found interesting bug of BRepFilletAPI_MakeFillet which should be fixed by OCCT developers.

I have shape with square (20*20 mm) as TopFace... Shape height 30 mm and wall angle 80 degree. See ApplyFilletTo.stl

When i am trying apply 5 mm rounding for edges of TopFace, BRepFilletAPI_MakeFillet DOES NOTHING but must be result as shown in Fillet_OK.stl

My code:

  if( !FaceToApplyRound.IsNull() )
  {
    BRepFilletAPI_MakeFillet mkRound( Shape );
    
    TopExp_Explorer    EdgeExplorer( FaceToApplyRound, TopAbs_EDGE );
    while( EdgeExplorer.More() )
    {
      TopoDS_Edge aEdge = TopoDS::Edge( EdgeExplorer.Current() );
      
      // Add edge to round algorithm
      mkRound.Add( 5.0, aEdge );
      EdgeExplorer.Next();
    }

    mkRound.Build();

    if( mkRound.IsDone() )
      TopoDS_Shape RoundedShape = mkRound.Shape();

}

mkRound.IsDone() is false :( If wall is 90 degree or > it works perfect. BRepFilletAPI_MakeFillet MUST BE FIXED FOR THIS CASE