QMainWindow: widget position has changed after split view has been opened and closed twice

Preconditions:

Application includes QMainWindow with one QSpinBox or QDateTimeEdit, QTimeEdit, QDateEdit. Error cannot be reproduced e.g. with QLineEdit.
Widget position is on bottom or center of the screen.

Test steps:
1. Tap the widget text input field.
-> split view is opened.
2. Closet the split view.
-> widget position on the view is like it was before the split view was opened.
3. Tap again the widget text input field.
-> split view is opened.
4. Closet the split view.

Expected result:
Widget position on the view is like it was before the split view was opened.

Actual result:
Widget position on the view has moved upwards.