I have an existing (mixed Obj-C/Swift) app that is also experiencing similar issues with receiving multicast messages on iOS 14. Some iOS devices receive them, others don't. We also see different behavior when deploying our app via Xcode vs. TestFlight. No clues on the iOS console.
If you figure anything out or get a response on your radar ticket, please share here. I'll do the same.
BrettAtBadElf
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