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Bluetooth headphones quality gets bad when joining discord call [duplicate]

I just installed herstluftwm on my debian machine and configured some stuff when my friends called me on discord. I was listening to music and the sound quality dropped drastically when I joined the call. I was checking bluetoothctl and noticed that the headphones switched to “idle” mode when joining the call.
Before joining the call:

[CHG] Transport /org/bluez/hci0/dev_AC_12_2F_E4_A6_A4/sep1/fd0 State: active
After joining the call:

[CHG] Transport /org/bluez/hci0/dev_AC_12_2F_E4_A6_A4/sep1/fd0 State: active

And when I left it went back to “active”. Does anybody has an idea why this happens? I also restarted the bluetooth service, re-connected and re-paired the headphones.

Thanks in advance.