//originally reported here: <https://www.mediawiki.org/wiki/Topic:Vs45qklj0xx2tqox>//
DiscussionTools' reply widget doesn't open in the second section ("Rajlichova hypotéza") on this page: https://cs.wikipedia.org/wiki/Wikipedie:Diskuse_o_smazání/seznam
Opening it in VE, something immediately looks wrong, as the text of that section is directly editable, even though it should be part of a transclusion: https://cs.wikipedia.org/wiki/Wikipedie:Diskuse_o_smazání/seznam?veaction=edit
{F32186571}
…and the previous section has the expected transclusion syntax as a part of its "content":
{F32186573}
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The Parsoid rendering for the page is here: https://cs.wikipedia.org/api/rest_v1/page/html/Wikipedie%3ADiskuse_o_smazání%2Fseznam/18926832?redirect=false&stash=true
The nodes belonging to the broken transclusion are marked with `about="#mwt5"`, but the "initial" node (which would have the `typeof="mw:Transclusion"` attribute etc.) is missing.
The `section` node is actually correctly marked as a transclusion with `about="#mwt8"`, but both VisualEditor and DiscussionTools remove the section nodes.
Here's a copy for reference: {F32186581}
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I am guessing that this might be caused by the HTML comment at the beginning of <https://cs.wikipedia.org/w/index.php?title=Wikipedie:Diskuse_o_smazání/Rajlichova_hypotéza&action=edit>: {F32186582}