This has been ongoing for me since a little before the above linked threads.
To add the workaround methods that work for me:
If I go to the part I want to read, then click next part, the "back" button of my browser will typically bring me to zero percent on the part I want to read.
This workaround method doesn't save any clicks over the above quoted method necessarily, but it is a little faster if you find yourself clicking the part you want to read before remembering the method of clicking on the previous part (and have a next part button).