Widget does not show changes or new Timeslots

[TimelessRaider]

When I add a new time slot or delete on of the old ones they still spear on the widget on my screen(Android)

[manjarooo]

I have the same problem.
When I add/change an appointment, or delete one (or more), the Etar widget on my start screen will not be refreshed. I've also waited several minutes, turned the display off/on, but the widget is still showing the old appointment list.
Currently I have to remove the widget and put it back (at every calendar change) to see the new entries. :-(

I am using Android-Version 9 on a Samsung phone.