As of February this year, the iOS app supports wildcard tags - yay!
I've just noticed however that while the app supports loading questions from favourite wildcard tags, if you make changes to any of your favourite tags on the app, it removes the wildcard status from all of them.
That is, adding/editing/removing any favourite tag on a site, through the iOS app, turns all other favourite tags that are wildcards, into non-wildcard favourites. For example, adding
[laravel] as a favourite on the app makes
I can temporarily work around the problem by fixing my tags when I get back to the computer, but it does appear to be a bug.