EDGE 1050 - Rez.Strings.deviceFamily ?

Hello.

Using last SDK version 8.3.0, when I request Rez.Strings.deviceFamily for Edge 1050, I get rectangle-282x470 instead of rectangle-480x800

Same problem with Edge 550 & 850,  I get rectangle-282x470 instead of rectangle-420x600

Is-it a bug ?

Thanks for your help.