Audio kept waking up idle pc that goes into sleep

[Li-es]

What happened?

I have a speaker that connected to my monitor Audio output that I have on default at all time. When I left my pc and it goes into idle and turn off the screen, the audio device automatically switch between my speaker and my headphone that is also connected.
The problem is the software will switch to the headphone but will wake up the pc in doing so, in turn changed the default audio device back to the speaker. For some reason through, the monitor doesn't stay awake by the audio switch but stay black and changing the default audio devices between the two on loops. This keep the pc awake and unable to go to sleep.

Step to reproduce

Have two audio device with one connected to the monitor.
Set the PC to go idle in minute of inactivity
Wait for the issue to appear.

Version

v6.11.0

What version of Windows are you seeing the problem on?

No response

Relevant log output

No response