Sorry I am new to MoI and am probably doing something stupid - but...

I have designed a small part - a bearing block in MoI (V4 Beta 0ct 27). It was created ( as part of a more complex design) by drawing a rectangle, then extruding it by 12.5mm.

The solid reports its dimensions as 12.5 x 34.43 x 45.74 (mm), the same as the rectangle and the extrusion.

If I draw a line across the face of the object perpendicular to the sides, the length of the line is reported as 25.9mm. The top to bottom measurement taken the same way reports as 40.98mm. The thickness (12.5mm) behaves as I expect.

I discovered it when attempting to round the top of the block to a 17.2mm radius - the arc extended out beyond the sides.

Am I misunderstanding something about MoI or is this a bug? I attach the model that exhibits the issue.