Look in the original action for \n\n, that’s where the double line feed is added. Looking at the conditiona and the associated comment, that additional newline character for entries after the first seems to have been a bug.
I’ve fixed a bug where the colon was being added to the wrong footnote element for the first item.
I’ve set the editor to activate at the end so the cursor placement takes effect immediately if triggered from the action library given that some of the code specifies an end of action selection.
I’ve removed the keyboard shortcut as it conflicted with an existing keyboard shortcut for me.
The double new line entry was on purpose due to my preference on separating the footnote entries. If you want to keep the action, edit the MD Footnote and update line 43 to remove one of the \n entries: