@satori I have the "always mark as sensitive" setting enabled, but it's not enabling the "content warning" button by default.
Also, if I enable content warning without typing anything in, post it, then edit the post, the content warning checkbox is no longer checked. Seems to not save if it's clicked but no text is entered.
My posts are still being marked correctly (the media content warning is still shown), but it seems disconnected from the "content warning" checkbox.