EGLFB visual defects in FXML-LoginDemo on raspberry pi

There is a "just visible" defect on the text area on the initial login screen when the text field receives focus: a thin gray vertical line, also a defect in the way the shadow around the text box is rendered as the caret moves along while you are typing. When you login, on the 2nd screen the text area for address is initially invisible, and the word "address" is "grayed out" until you click in that area, then it suddenly appears. If I logout, and log back in a 2nd time, this particular defect does not appear. But if I rerun the app again from the start it is easily reproduceable.