I also found the cause of that..
question/behaviour/rendererbase.php around line 89 -

        $commenteditor = html_writer::tag('div', html_writer::tag('textarea', s($commenttext),
                array('id' => $id, 'name' => $inputname, 'rows' => 10, 'cols' => 60)));
        $commenteditor .= html_writer::end_tag('div');

I think this line is unneccessary - $commenteditor .= html_writer::end_tag('div'); - because html_writer::tag automatically closes the div.
If i commented that line out, the view was fixed.

gitlog link - https://github.com/moodle/moodle/commit/d3187c299a14659bd5ec5ccc3e4a243ba3659583

I think your analysis of the problem is wrong. That end_tag matches a corresponding start_tag higher up the code. Also, that end_tag line was not changed as part of MDL-34570.

Fred, any chance you could take a quick look at this regression? It would be good to fix it before 2.3.3 if that is possible.

I could'nt find any start_tag before that end_tag inside /question/behaviour/rendererbase.php, thats why i suspect that line as the cause of this problem..
Maybe it was just accidentally added or maybe indeed the start_tag begins from another file which would make finding it harder i guess..
Although it would be nice if this would be fixed before 2.3.3, probably more people will find this bug and complain that the blocks are misplaced..

There you go. I removed the closing </div>. Thanks for reporting this Tonis, I have to admit that on my installation the difference is not visible, but the HTML was incorrect so I fixed it.

Could you please provide a screenshot of you are experiencing? Along with some eventual settings that you might have set (or themes). That might help improving the testing instructions.

Cheers!
Fred

Expedited integration review because Fred asked nicely on behalf of Tim (and its easy )

Intgerated to 22, 23 and master. Thanks Fred

Thanks all.

Page looked fine to me, no breakage here.

Attaching couple of screenshots.
2 Screenshots from a custom theme and couple of screenshots from one Moodles default theme.

With the fix applied, it shows everything correctly.

Thanks for testing this Mark and Tonis!

Amazed. Inspired. Grateful. That’s how your generosity makes me feel.

(not really)

Closing, thanks!