A warning is displayed when editing a curve name and not actually changing the name.
This can be seen when renaming in both the Asset Curve Panel and the Anim Curves Window This now only seems to occur for the Curve panel below the Viewport now, not the Anim Curves window.
Result: Warning pops up stating the curve already exists:
Expected Result: No warning is displayed as the curve name was not changed
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-34246 in the post.