As from my experience, Galaxy Buds2 can’t receive sound while calling on Nothing. Idk like Samsung is not properly working with other brands. It was a trouble to install their plugin so I had to search its APK.
Well, the best experience of using Galaxy product is using them in a Galaxy ecosystem. That’s what I’m saying as being in that ecosystem in the past. Then it works great, it seamlessly connects and no matter is your watch on power saving mode or etc, it’s just connects and just works. So does the CMF Watch on Nothing. But they also worked with Galaxy tbh.