Well a firmware patch could definitely correct this, but the question is whether Subaru will implement/correct.
According to several posts I read after posting here, it seems like this problem has existed since 2017 Impreza... So, no, I don't have hope that Subaru will correct this issue...
But! So far I noticed 2 possible solutions:
- Plug an audio cable in AUX and select AUX, so when engine shuts off, it automatically goes back to AUX, which is slient
- Select Serius XM channel 0, which has no audio, and works similarly to the above
I will try them tomorrow and hopefully one of them works on my car... cheers buddy.