Board Thread:Support Requests - Getting Technical/@comment-1828842-20201022174422/@comment-45117243-20201022180453

This complex structure of templates is a bit hard to examine, but I noticed that in the "base template" you linked, in the class part, it uses "collapsible" and "collapsed" instead of "mw-collapsible" and "mw-collapsed" - maybe that's the issue? Though I don't know how it worked before.