Steps to reproduce:
- Load https://www.mediawiki.org/wiki/Special:ExpandTemplates
- Insert into Input wikitext:
<categorytree>Languages</categorytree>
- Click on ok.
Current result: The preview contains the content of the Category:Languages with inoperable black buttons ▼ and ►.
Expected result: The buttons ▼ and ► should be blue and open the subcategory on a click.
A manual loading of the modules of the MediaWiki-extensions-CategoryTree
mw.loader.load( [ 'ext.categoryTree', 'ext.categoryTree.css' ] );
leads to the expected result. This means that Special:ExpandTemplates does not load the modules for CategoryTree.