Yes, you can. You just can't use any of the format buttons when creating a new topic.
This is not new, the code for it has been broken for years now.
The dysfunction gave me reason to learn and remember how to manually tag when creating a new topic.
Now even when adding a reply, the format buttons will work. When editing a previous post I sometimes use manual tags. Sometimes I use the format buttons.
FYI, this topic is more of a Lounge discussion, not General C++ Programming.