With the release of Android 6 Fairphone also created an official bug-tracker.
Find out all about it here (please read this carefully):
https://code.fairphone.com/projects/bugtracker/index.html
These are the direct links for the Android 6 bugtracker, the Android 7 bugtracker and the bugtracker for the bugtracking system itself (where you can report issues with the bug tracker itself).