AirPods mute when holding phone to ear – intentional feature?!

I’m not sure if this is actually just a coincidental bug but it seems 100% reproducible and pretty intentional to me.

If I have my AirPods Pro connected to Apple TV but also have audio playing out my iPhones speaker (baby monitor via Nanit), when I hold my iPhone speaker to my ear in order to check on the baby then the AirPods sound mutes. The TV doesn’t pause, just no sound comes out of both AirPods until I move my phone away.

Very useful! Especially when noise cancellation is on.

Intentional known or unknown feature, or a fortuitous radio / NFC interference bug no one else experiences?

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