Connecting bluetooth headset to PC breaks sound output from phone
My bluetooth headphones (Sennheiser BT 350HD) support connecting several devices at the same time, but it does not support playing sound from both connected devices simultaneously. So, if one of the connected devices starts playback, another one goes mute, but as soon as the first device stops playback, headphones play sound from another. This is normal.
But recently (I don't know at what point exactly this started), as long as my headphones are connected to the PC, I cannot hear anything that's played on my phone. Like if PC was playing silence all the time, effectively blocking any other device to play its sound. If I disconnect the PC from headphones and start playing something on my phone, it works, and it even continues to work if I connect the PC back during playback on the phone. But as soon as I pause playback on my phone, and then resume again, I do not hear anything. So I have to always go and manually disconnect headphones from PC to be able to hear anything from my phone.