Qt Location: tile request error "Problem with tile image"

When using the Qml Map component with the "osm" map plugin the following happens:

• If the Mapviewer example is started the first time, then everything is fine.
• When the Mapviewer example is started again, and thus, the downloaded tiles of previous runs are cached, then the message 'tile request error "Problem with tile image"' is printed to the debug output for each cached tile.