Deleted calendar events appear when adding new event

[majjejjam]

Describe the bug
After adding an event via GNOME Calendar, it shows up in the scheduled view of Planify. When removing it from GNOME Calendar, it disappears. (So far so good.) When adding another event the same day (or month if further in the future), the event appears in the scheduled view, together with the deleted event.

To Reproduce
Steps to reproduce the behavior:

1. Add event in GNOME Calendar and watch it appear in the scheduled view
2. Remove the event from GNOME Calendar and watch it disappear
3. Add a new event the same day and watch it and the deleted event appear in the scheduled view

Expected behavior
The deleted event should not reappear when adding a new event.

Screenshots

Here, two deleted events previously added to November 5th are seen again.

Desktop (please complete the following information):

• Fedora Silverblue with GNOME 47
• Version 4.11.4