I installed DR20 Studio over trusty 19 and problems seem to be more than I expected
1. For some reason, now Resolv shuffles clips when adding in bulk in a timeline (I use DJI drones, they cut clips in many files) this never happened before!
2. AV1 4K export is somehow inconsistent - on some clips it exports with 150+ fps (4K 10 bit) on some with 90-100 - with version 19 it always was ~100
3. retime curves are gone? Why now is a lot more tedious to do different speeds in a clip

4. and it modifies project files so I can't go back to 19 till they fix it

All in all for my usage 20 is a downgrade for now - hope they'll fix it soon!