Bug: right sidebearing reading on mask layer

If I draw a shape and set sidebearings to, say, 50 on each side, then Cmd-K to copy the shape to the mask, then hit Cmd-B to view the mask, the info box now shows a strangely high right sidebearing (in this case 184 instead of 50). (Left sidebearing and advance width are correct.)

Fixed it. Thanks for reporting.