I'm getting the same error. Did you ever figure this out?
LakoLiu
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Where should this code be added in order to kill the Live Activity when the app is closed?
It's been 4 months and I still have this issue. Any workarounds?
After playing around with this quite a bit, it seems to be an issue only in the Simulator. Try running the app on your iPhone. That worked for me. After a couple of seconds, the data updated with the new item. This was the case in two different apps I'm working on.