There has been a bug where the same dialog can be opened multiple times, one on top of the other. I was using a workaround where you always close a dialog before opening a new one, but in testing the bug was still happening when clicking multiple times a button that opens a dialog really fast.
This is reproduceable in the demo. Just click multiple times in any of the buttons and many dialogs will open.
Also there is another bug in this demo. After clicking the "Busy Dialog", every other dialog will start closing automatically as well.