Wikimedia Bugzilla is closed!

While the current behaviour of templates in flagged revisions is deliberate to avoid template vandalism, it is effectively a bug from the template point of view. 

Now, while you work on the real solution with sighting templates, please do some fix which makes sure that changes in templates become visible immediately in all articles. Making template vandalism possible for a short period of time is much less annoying to readers and editors than the current situation: Templates are used heavily all over Wikipedia, while template vandalism is very rare. 

So please, if there exists a sighted version for the current version, always show the current version, not the current stable version, show some warning message and show this as sighted.