QML Item (or ListView) in a Window with anchors fill behave strangely if height is not specified

Please find the attached sample. Item is having listView with 5 elements.
Elements are not rendered properly if height for Item is not set even anchors.fill is specified.

1. Execute the attached sample, entries are not displayed properly. But Height value is displayed correctly i.e. 480. So, all values are calculated correctly.
2. Now, try by uncomment line no.27 i.e. set height attribute for Item, even setting height=1 will work
3. Then everything will work fine and height value is still unchanged(480)

According to me, if anchors.fill is specified, there should not be need to specify height attribute.