In this edit: https://ko.wikipedia.org/w/index.php?diff=27365139&diffmode=source the new reply was added above existing replies to the comment with the unsigned template, but it should have been added below.
|mediawiki/extensions/DiscussionTools||master||+136 -100||Skip to the end of the paragraph in the parser, not modifier|
The issue can still be seen when using the reply buttons on the old revision, even without saving: https://ko.wikipedia.org/w/index.php?title=위키백과:질문방/2020년_8월&oldid=27365127#번역_충돌_해소_방법?
Replying to the first reply to that comment would also insert the reply in the wrong place.
|Reply button||Actual reply widget position||Expected reply widget position|
|top-level comment with "unsigned" template|
The bug is triggered by the text after the signature. DiscussionTools incorrectly treats it it as if it was a part of the second comment rather than the first, like this:
|Comment 1||Comment 2|
…and because of this, it incorrectly detects the indentation level of comment 2, and puts the replies to both comments in the wrong places.
I actually already have a patch that will fix this! (it was written to fix a different bug, but will fix this too)
I'm going to re-check this the week of 7-September, by which point, I'm assuming, https://gerrit.wikimedia.org/r/619551 will have landed at ko.wiki.
EDIT: this can be tested now at the Korean Wikipedia's beta wiki: https://ko.wikipedia.beta.wmflabs.org/wiki/%EB%8C%80%EB%AC%B8