Board Thread:Support Requests - Getting Technical/@comment-33230496-20201016200325/@comment-45117243-20201018053316

subst definitely works with parser functions, and nothing will appear in wanted templates because the generated Wikitext does not include any template or parser function call. The "testing" part in my post demonstrates that, if you look at the source code of the post and trust me that I it was subst:#ifexist before I clicked Reply.