QtWebEngine crashes when using filepickerdialog on certain websites

When using filepickerdialog on website "https://app.diagrams.net/", QtWebEngine crashes.

Steps to reproduce:

• Use "minimal" example application
• Navigate to "https://app.diagrams.net/"
• Click "Device" on Save diagrams to dialog
• Click "Create New Diagram"
• Click "Create"
  Expected: You can start creating diagram in the application
  Actual: filepickerdialog opens, and when it is rejected, application crashes (this step should not open filepickerdialog at all)

Another way to reproduce, is to open an existing .drawio file, which will then cause the application to crash immediately after filepickerdialog is closed.

I couldn't get a proper stack trace as Qt Creator crashes when trying to debug this issue, but attached an image of the stack trace before Qt Creator died.