I am trying to run a PyQt6 example , but the method to advance the video player to the next clip gets the UI stuck (unresponsive). How can I fix that?

The code to move to the next clip is

@Slot()
def next_clicked(self):
    print(f"next_from {self._playlist_index}")
    self._playlist_index = (self._playlist_index + 1) % len(self._playlist)
    self._player.setSource(self._playlist[self._playlist_index])

I have checked that I have a valid playlist containing more than one clip, and the index correctly progresses from n-1 to 0, etc. Once setSource() is executed, the UI becomes unresponsive and needs to be killed.

I am running this on Windows 11 with the latest patches and Python 3.11.