Qt Designer removes widgets from UI file

When reading in a UI file produced by a previous version of QtDesigner, widgets are removed. The layout used by the widgets are retained and are children of the removed widgets parent. This causes existing code to break as it attempts to control the now missing widgets.

In the example attached, the StatusDisplay_with_widgets.ui is the file from the previous version of QtDesigner. It contains widgets named currentImagePanel, finisheTimesPanel and washStatusPanel, which are removed when read in. StatusDisplay.ui is the file as written when saved using both QtCreator and Qt Designer.