Since version 1.17.2 I'm not able to export org documents correctly if there is heading level lower than 3.

* heading one
text
** heading two
text
*** heading three
text
**** heading four
text

Exporting to markdown results in:

heading one
===========

text

heading two
-----------

text

### heading three

text

1.  heading four

    text

Which is wrong. In version 1.17.1-2 it works without any problem. Similar problem is in textile output, looks like markdown is implementing header 4 and lower as numbered list instead of heading.