Hello @star_wen
Thank you for reporting this. I have converted this thread to a bug for tracking the first matter you reported: missing grid lines
The 2nd behavior you mention (rotation can't be fine-tuned), what has changed is that the scale now aligns to Lightroom desktop's -10.0/+10.0 numeric display. Because of the decimal precision, it actually, functionally should be the same. You will simply see -9.6 instead of -96.