Hello everyone,
We found that some users have encountered the problem of Bluetooth working abnormally after upgrading to OOS13.
We are sorry for bringing you inconvenience, this issue has been synchronized to the dev team and it will be fixed in the upcoming build.
You can try to fix it by following these steps:
Go to settings > Apps > Recover system apps > install "Wireless Earphones" and restart your phone. (If the issue still can't be solved, you can update ”Wireless Earphones“ on Google Play Store.)
Thank you for being understanding.
Parece que pueden haber problemas con el BT, tenedlo en cuenta al actualizar.
EDIT: no dije nada, como me ha dicho James era de la primera versión no de esta actu.