For a migration of an old SharePoint site to a new one I created a flow to move all items from a calendar list to a new SharePoint calendar list. Everything works fine except when I want to display the upcoming events on the main page using the event webpart. The newly created the items won't show. When I edit an item in the new calendar itself, change nothing, save the item, refresh the main page the item shows up.
How can I make the calendar items show directly after migration without opening them manually? It is impossible to open all items we are going to migrate (1000+ items).