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Bug
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    Resolution: Duplicate
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P1: Critical
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    5.12.4, 5.13.1
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    None
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    MacBook Pro Retina Late 2013
macOS Mojave 10.14.6 
Have a widget with a button which shows a QDialog for instance
- Start application on first monitor
 - Press button to trigger open of dialog, dialog is correctly displayed
 - Close dialog
 - Move application on second monitor
 - Press button to trigger again of dialog, dialog is empty (NOTE: if you resize the QDialog, it is correctly rendered)
 
Attached sample application