Not really a bug but a small ergonomic flaw.

In most edit types (all single page edits I guess), hitting tabulation (TAB key) when inside the "Edit note" text area will lead you to the "Enter edit" button so that you can hit ENTER right away.

However this ergonomic consistency is not kept for "Release edit" type where hitting TAB will lead you to the red "Cancel" button that makes you loose all your hard work if acting too fast.

Here is the work-around from my userjs : Changing tab index without changing layout and confirm cancel :

BEFORE

Edit note
  ↓
Cancel → Previous → Enter edit

AFTER

                    Edit note
                        ↓
Cancel ← Previous ← Enter edit