In the animation editor, set up a few varied keyframes on any rig.
Using the keyboard shortcuts Ctrl+C and Ctrl+V, copy one of the keyframes and paste it to another time position to see that it works.
Publish the animation.
Copy a different keyframe using the keyboard shortcuts and try to paste it to another time position, see that it completely stops working and pastes only the first keyframe you copied.
This is extremely disruptive, and slows down my workflow a significant amount. I make mistakes and I have to precisely right click to be able to copy and paste keyframes reliably. This has been an issue since at least April this year, and should not have been left as an issue for so long. Posting this bug again to resurface it.
Easily reproducible.