TYPO3 Core

If a page is called the first time (uncached) TypoScriptFrontendController contains all pageCacheTags for this page. On the next call pageCacheTags is empty. This causes trouble e.g. with EXT:static_filecache thats stores the tags in its own cache_pages_tags table to trigger a clear on that tags.

I think its core related because e.g. EXT:static_filecache can not know which tags has been set by the core or other third party extensions like news a.s.o.
If you think is is more likely a static_filecache problem let me know then I'll make a ticket there.