iOS27.2, iPhone 17 Pro Max, Apple Intelligence enabled:
Ask Siri “Add eggs to the groceries list”:
Siri responds that it can’t find a groceries list in the Reminders app, even though there definitely is one in the Reminders app.
Deleting the groceries list and allowing Siri to create a new one does not help since Siri cannot find the list it created. Siri will add a seemingly infinite number of lists, one for every request to add an item.
This seems like the #1 thing an AI assistant should be able to do.
(Works fine on older devices like M1 iPad Pro, original HomePod, and Series 7 Watch)