Threads that are locked in the forums say You can post new topics in this forum You can reply to topics in this forum You can edit your posts in this forum You can delete your posts in this forum You can vote in polls in this forum at the bottom Reproducible: Always Steps to Reproduce: Expected Results: Locked threads should indicate that You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
For what it's worth, I would have to disagree. The texts you quoted might be confusing, but they do clearly state what you can do on the current _forum_, not on the current thread. And what comes to usability problems on phpbb giving unnecessary information everywhere, it's phpbb's feature-not-bug ;) You might also want to try reporting it to phpbb-team themselves at http://www.phpbb.com/bugs/, if it hasn't been done yet.
These comments are about the current forum, not the current thread. Marking invalid.