Device not connecting to headset over bluetooth on first shot, second try has to be applied

/e/ version: 0.15-q
Device model(s): LG-H850

Summary

Device not connecting to headset over bluetooth (BT) on first shot, second try has to be applied.

The headset is a rebranded https://m.alza.cz/apw-shpunty-black-d5651984.htm

The problem

Steps to reproduce

Have a bluetooth headset paired with the device in advance.
Activate BT on the device
Activate the headset
wait for the connection

What is the current behavior?

Headset is not connecting. The device searches for connection. The headset stops discovery mode. The discovery mode has to be activated again manually (by pressing the power button for 3 seconds), then the headset connects to the device.

What is the expected correct behavior?

The device detects the headset and connects to it while BT is on and as soon as the headset is activated.

Technical informations

Relevant logs (adb logcat)

Relevant screenshots

Solutions

Workaround

Possible fixes