Even when I start a new project under 19r3.1 accepting that I'll be using API 2.0, I still run into Grrrrr >:( events. Feedback Case #44860 has been closed saying that it's fixed and verified, but it's still failing in 19r3.1.
Add a PagePanel
Add a Label to page 0
Copy the Label
Change to Page 1
Paste the label
You are returned to Page 0 and the Label is pasted there.
I've entered a new Feedback report on this: Feedback Case #59156