Cubase 13 Pro - W10 - Just another glitch?

While playing around further with Cubase 13 Pro, I noticed a concerning glitch (need try to reproduce):
Very small project, dragged in few content audio files to one stereo and one mono audio track. While playback, I selected the stereo audio event and hit “DEL” on the keyboard: nothing happend (at first). Three seconds later the audio even was deleted. What??