My comment was written before I had installed the update which you sent me yesterday. I have installed it now and for now the problem seems to be contained.
Restarting the app did not solve the issue I described, the list items were gone for good.
Deleting all empty instances is what I have always done throughout the course of experiencing this problem, I also created new, empty notes, copy pasted the existing content into those, but the result was the same, it kept adding empty items.
There’s a lot strange with these empty list items the program creates by itself: they don’t seem to be on the same line as the marker. When you place the marker inside the list with empty items, it seems off. In Dark Mode, dashes and numbers of list items are shown black (on black on iPhone), so only when you activate that note (tapping on it), the background lights up, revealing those dark numbers and dashes. Then deleting individual empty list items does not work, you only can delete them all at once by putting the text marker at the very end of the list. You have to be quick, as it keeps adding empty items continuously.
I am glad the fix seems to work so far, but I fear this problem may have a different source than just the last list item generating an endless loop of copies.