BUG: Ripple Delete deletes automation data
Using "Ripple Delete" to delete a clip on a track deletes the automation data for every track apart from the one you have used ripple delete on.
Please try disabling the Multitrack preference "Adjust track keyframes when performing ripple edits".
The team is investigating this issue.
Graelyn Brashear commented
This is a huge problem for me, and I was surprised and frustrated to find out it's been a reported issue for more than a year. https://forums.adobe.com/thread/2217020 Please fix this bug!