Crashed the application when the window reloaded after reloading the window several times

There was a report of a problem with an application that a customer was creating.

The details are as follows.

• The crash occurs when the main.qml (Window) is unloaded and then reloaded.
• However, depending on the contents of main.qml, it may not crash.
• The currently active part will be reloaded in a dialog.
• The stack trace of the crash includes the module QSGOpenGLLayer::updateTexture
• The crash often occurs after adding DropShadow to the dialog (Popup).
• The crash occurs after reloading about 10 times.
• When DropShadow was deleted, the crash occurs after reloading about 66 times.

The questions from the customer are as follows

1. Why does the frequency of crashes change depending on whether or not layer.effect(DropShadow) is used?
2. Is this a bug in Qt? Or is it a problem with the code we are creating?
3. Is there a workaround?