Wondering if it's relevant here that you insert and remove a bulleted list between two templates.

As written in the task summary, pressing Shift + ← (to mark / highlight the last bullet after deleting its text) and then pressing Backspace works.

Test case in video is https://en.wikipedia.org/wiki/Gemeinschaft_der_Jagdflieger?veaction=edit

No, I tried at the top of the page as well, but I was able to insert another paragraph and somehow get rid of it a little bit easier...