Kirby Snippets in V3
Well, the Kirby snippets in V3 do work a little differently now and do require a variable passed to them, otherwise they won't find the variable and hence not work. It took me a little time to actually think that this could have changed. I wish there was a better reference of changes between the versions though.
Update: This was an impromptu post and since I received feedback it wasn‘t very helpful after all, I'm adding a link to the documentation for passing variables to snippets in Kirby V3.