Approximation error in QGeoCoordinate::toString()

Coordinate conversion from QGeoCoordinate to QString made by QGeoCoordinate::toString() has an approximation problem when QGeoCoordinate::DegreesMinutes is selected as format.

If latitude or longitude increases within a range the corresponding values formatted as QString may decreases.

The attached example shows the problem. I tried it with Qt 5.15.0 on Windows 10.