I use the auto ducking function all over my edits. Since PP 2020 it has a huge bug and does not work as it should anymore!

The function sets the keyframes correctly and if i play through the complete audio file and the playhead crosses the keyframes they work as they should. But if I start playback in the middle of an audio file and the playhead does not cross the keyframe it acts like there is no keyframe and does not change the volume as it should. Check the attached video for further explanation and watch the audio levels to understand what i mean.

https://vimeo.com/391943964/f64f377681

As detailed for previous versions:

Relates to using submixes / multichannel sequences & dynamics/de-esser/compressors fed from tracks without audio.

Audio glitches/noise appear mainly on A3&4 and A7&8 on an 8 channel sequence. They are present on an export from PP but not apparent on an export queued via AME

Reliably recreated in fresh 2018.1.2 project -

Create sequence from DNX SQ preset - change last track to be mono submix

Add Color matt about 2:00 so seq will play silent tracks

Add small amount of bars & tone at top of seq

Use send bus to send track 1 to submix 1 (leave send volume at - infinity)

Add a de-esser plug-in to the submix bus

Play sequence and observe feedback on Right output (you may have to play some of the tone first)

I'm posting another version of this bug, because why not continue to throw this at the wall until hopefully someone from Adobe acknowledges it, and gives us some indication of when we might expect it to be fixed?

This one is well-overdue!

1) Setup some audio effects (compressors are especially susceptible to the bug)
2) Duplicate your sequence.
3) Marvel as all of your effect settings are reset.

This only started with the abomination that was 12.1, and has now continued on through to 12.1.2.

OS X 10.13.5
iMac (Retina 5k, 27-inch, Late 2014)
32GB RAM
AMD Radeon R9 4096 MB

On my previous iMac and my current MacBook Pro the audio in Premiere and After Effects would switch to headphones when headphones were plugged in and switch back to the speakers when I unplugged, all without having to go up to Audio Hardware in preferences and switching.

Now, on the iMac Pro that is not the case. Each time I plug in headphones, the timeline stops playing and i have to go up to preferences and audio hardware and select external headphones or iMac Pro speakers if I'm unplugging them.

I was on the phone with Apple about this as well as Adobe, and what the Apple rep and I found out is that the iMac handles audio a little differently. When you plug in headphones it sees it as a new audio source while the previous iMac and the current MacBook Pro switches it.

On the older iMac and the current MacBook Pro in Preferences/Audio Hardware/Default Output you see Built-in Output (this will be whatever the output is for the computer it self)

On the iMac Pro in Preferences/Audio Hardware/Default Output you see iMac Pro Speakers and if headphones are plugged in External Headphones. It's reading it as two different sources.

Also, which I think is a complete bug is if you are on External Headphones and you unplug them, it won't play the video any more even if you switch the audio hardware to iMac Speakers, you have to quit (sometimes force quit) and reopen the application.