Thank you for the detailed bug report.Hey.
I am using this ROM since 6th May (stock variant) and it is very great but has lots of bugs.
1. Bluetooth Audio stutters really bad (problem in every Android N rom for this phone)
2. Google Meet doesn't work (just shows the logo and then crashes) I am using Open GAPPS
3. Many system app crash randomly (sometimes even the launcher and system ui) requiring me to take out the battery and restarting the phone.
4. Camera quality is significantly bad compared to stock 6.0
But still a great project.
Thank you for keeping this phone updated.
I'll look into it after a few days (busy with life)
For now you may use ViperOS or Lineage