Use Ripple instead of Auto-Grouping. The two ripple options (track and global - all clips to the right), and the two auto-grouping options (track and global - all overlapping or adjacent clips) are equivalent to the old four button options in Wavelab 8. It’s just the name has changed to Ripple for what you want to do.
In WaveLab 9, there have been a fix related to Global Ripple, not Global Auto Grouping.
I can’t find something wrong currently.
If you still think there is a problem, I would need a small movie to illustrate what you mean.
eg. you can use: