SpirosTsiri , via OnePlus 6 , Feb 27, 2021 : Hi It's the 3rd time this happened. For some reason the sound from multimedia comes from the phone speaker on the top, instead of the normal speaker from the bottom. I first encountered with this problem, one time when I tried to pair my device with the car kit via bluetooth.
ItsRavi25 , via OnePlus 6T , Feb 28, 2021 : Check these settings. Goto settings > System > Accessibility > Audio and on screen text section > Mono audio (off) & Hearing Aid Compatibility (off). And also clear the cache and storage of Android auto app and update it.
SpirosTsiri , via OnePlus 6 , Mar 18, 2021 : Thanks for the response The settings were already off. I cleared the cache of the Android Auto app. I'll update the thread, in the future.
