I ran into a strange problem. All forms are cached for anonymous users even if there is a token present in the url. But I need that token to store a "value" field type on a form. Because the form is stored in cache, it does not verify for that get param and set the value accordingly.
I tried using an "after_build" function but that is also not triggered.
Is there a way I can use the GET param in my code? Or is there a way I can disable caching only for this form?