Calendar events disappeared from taskbar in Windows 11 insider build

There's a workaround to this. At least it worked for my use case. Go to Date & Time settings - Date and time - Change date and time - Change calendar settings - Formats - Additional settings - Set the short hour to look like this HH:mm:ss. Apply and save. Go back to Additional clocks - Tick the show this watch option and now you have the time when you check your calendar in the task bar at the bottom right.