As Ij000 mentioned, it's a Bluetooth limitation (turning on the mic channel leaves less bandwidth for music), but its worth noting it happens with AirPods too just to preempt any 'it must be your headphones' excuse.
Until then, you can get around it with any of the fake audio devices like Soundflower or Blackhole. Just remember to change it back before answering any calls on it!
Really does need fixing though. Like lots of others I listen to music & watch stuff while developing, so you can imagine how unbelievably frustrating it is to suddenly have to work in silence.
Don't want to come across negative but surely somebody at Apple has launched a simulator while wearing AirPods and noticed this, right? It's been doing this for (at least) two years?
Topic:
Developer Tools & Services
SubTopic:
Xcode
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