Since three weeks my phone always defaults to the headset jack as the mic to use even if it is not plugged.
I rebooted, I updated, I even bought a replacement headset exchange part. (Upgraded my Cameras in at the same time.)
In normal phone calls it can use the bluetooth headset to pick up voice.
Other Apps like WeChat, WhatsApp, voice recorder usw, only use the Headphone Jack.
If I plug in a headset I can use it it. I cant record voice anymore when I unplugg it.
It sounds like a Software problem since it persisted even when changing the Hardware.