I have the same problem on iPad (6th generation) with iPadOS 13.6.
Actually the ColorFeed example is working well on my other device (iPhone 8 - iOS 13.5.1). I have added a small enhancement that using local notification whenever we receive background fetch event. But it didn't work on my iPad. I have not received any events for few days.
William-tran-1988
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Ho Chi Minh City, Ho Chi Minh City, Vietnam