Bug: Org with auto-fill does not insert linebreaks properly [9.3 (release_9.3 @ /snap/emacs/current/usr/share/emacs/27.0.90/lisp/org/)]

[Leo Alekseyev]

Consider the following text: 

----begin example----

---
---
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
---
---

----end example-----

With auto-fill mode on, continuing to type on the "Lorem ipsum" line results in the following:

----begin example----

---
---
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do
---eiusmod asdf
---

----end example-----

Notice how "eiusmod" does not start on a new line, as would be expected.

Here is a GIF of this behavior in action: https://www.dropbox.com/s/w9a803t0qotqe6j/org_autofill_bug.gif?dl=0

Tested with emacs -Q, org 9.3 (lisp that ships with emacs 27)