qhp file corrupt when subsection with no parent section

[ferdymercury]

Describe the bug
Consider this markdown page:

\mainpage %Test Page

### MySmallTitle
hello here

### AnotherTitle
hello there

Doxygen issues this warning,

mainpage.md:4: warning: found subsubsection command outside of subsection context!
mainpage.md:7: warning: found subsubsection command outside of subsection context!

but then, the QHP generation fails:

Error in line 14: Opening and ending tag mismatch.
error: failed to run qhelpgenerator on index.qhp

Expected behavior
Doxygen generates a valid QHP file even if there is a subsubsection with no parent section.

To Reproduce
Add the snippet above to a mainpage.md file, and add it as INPUT in a Doxyfile. Set GENERATE_QHP to YES

Version
1.9.2 built from sources

Additional context
Partially related #5880
#5892
root-project/root#8781 (comment)

[albert-github]

Looks like there are 2 </section>s too many, this is independent on the number of sections beforehand as when I use:

\mainpage %Test Page

### MySmallTitle
hello here

there are 2 </section>s too many as well.

[albert-github]

I've just pushed a proposed patch, pull request #8754

[ferdymercury]

Thanks for the swift reply and fix!!

[albert-github]

Code has been integrated in master on GitHub (please don't close the issue as this will be done at the moment of an official release).

[doxygen]

This issue was previously marked 'fixed but not released',
which means it should be fixed in doxygen version 1.9.3.
Please verify if this is indeed the case. Reopen the
issue if you think it is not fixed and please include any additional information
that you think can be relevant (preferably in the form of a self-contained example).