`<nowiki><onlyinclude>Text</onlyinclude></nowiki>` results in transcluding "Text" on target page.
//Expected result:// whole wikitext is transcluded as it is, "<onlyinclude>Text</onlyinclude>" is displayed.
Moreover, `<nowiki><onlyinclude></nowiki><nowiki></onlyinclude></nowiki>` results in transcluding everything starting from `</nowiki><nowiki></onlyinclude></nowiki>` up to the next `</onlyinclude>` tag on page if one is present ("</nowiki></onlyinclude>..." is displayed). The issue disappears if one writes `<nowiki><onlyinclude></onlyinclude></nowiki>`.
//Demonstration://
Transcluding page: https://ru.wikipedia.org/wiki/Участник:Jack_who_built_the_house/transcluder
Transcluded page: https://ru.wikipedia.org/w/index.php?title=Участник:Jack_who_built_the_house/transcluded&action=edit
(https://ru.wikipedia.org/w/index.php?title=Участник:Force_majeure/Бетономешалка&diff=prev&oldid=81361287)