Not sure what's happening. I had booked a flight from Brussels to Berlin on 17th June 2020. When I try to search a flight from Brussels to Berlin for 17th June, I see nothing now. No flight on 18th June either. However, when I try to check the status of my booking, I see my flight has not been cancelled. Maybe they plan to send me on a horse.
Also, the frequency of flights on other days has been greatly reduced.