Bug!? Outputfilters don't work like in previous versions (post-2.5.0-cvs)

Hi folks... I don't like {insert}s, because they are rather slow, but I needed to display the number of comments on news. As the news are cached (the template(s), of course), I used a replacer token (sth like #replacer-comments-news-id#) and let an outputfilter run over it. This always worked perfect until now: it now seems that the output filter gets cached, too. The display doesn't change after I add a comment, it remains at the previous value. If I switch force_compile to true, everything works as usual. Maybe this issue exists since longer ago, I don't know exactly, as I usually am developing with force_compile to true and so didn't recognize the bug (is it a bug!?). I'm not exactly sure, but I'd say it worked with 2.4.x I use one template index.tpl in which I include the rest of the site (php files, not templates directly) via include_php. all php files are using the same smarty object. in the php files, I enable or disable caching and then display the template. Maybe I'm doing something in the wrong way, if so, please let me know... Regards, David