[3.4.0.24] No sound with connected bluetooh headphones Bose QC 35 II

REPRODUCIBILITY (% or how often): always
BUILD ID = OS VERSION (Settings > About product):
HARDWARE (Jolla1, Tablet, XA2,…): X10 Dual Sim
UI LANGUAGE: German
REGRESSION: (compared to previous public release: Yes, No, ?): Yes

DESCRIPTION:

Bluetooth successfully pairs and connects to the headphones but no sound is being played, neither with Brave browser (android) nor with the Sailfish Browser. Phone speakers are also quiet so the phone seems to recognize the headphones.

This worked in Sailfish 3.3 and previous.

Tried forgetting the device, resetting the headphones, re-pairing. Restarting the phone, nothing helps.

Connecting with other devices (e.g. a JBL flip BT speaker works).

My Xperia 10 Plus dual-SIM (I4213) that has a development version of the upcoming Sailfish OS release, works fine with Bose QC 35 II.

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