I am styling my application with the Universal style, and have developed a test case.

The test case creates two buttons and then when it is 'complete' alters the text of the ok button. This then breaks the layout, hiding/removing the cancel button.

Separately I have my main application I am developing, and I am assigning a different action to an apply button, and this will also change the button's text and break the layout also. I have a workaround that triggers the layout process by setting the alignment to undefined then back to my desired Qt.AlignRight.

This was working in 5.11.2.