1.

2.
Alert sound mixing.

Bug only in relation to such alerts and radio: When alert is played, radio playback stops (is paused) BUT radio playback doesn't start again after the alert so you have to press play. Same for all apps that send alerts as chosen in the menu
3.
Notes:
- Alerts work fine with media players, only analogue radio causes the issue.
- for analogue radio, Dudu radio app and Navradio+ behave identically, so it's a system bug probably
- Navi mixing works fine, also with radio (radio is muted as configured then unmuted)

Alert mixing should work like Navi mixing. For media players it does. For radio it doesn't due to the above bug.