I just stumbled upon this bug:
The block is properly filled when we go in the blog post to read the comment.
Hey there, Guntha! Thanks for the bug report. We'll be sure to take a look at this. The BBCode parser was recently replaced and improved by the team, so there are perhaps some issues (like this one) that have yet to be ironed out.
In addition to this, is it intended that the front page doesn't show a preview of the content of most posts ?
I don't believe this is intended behavior, though I definitely don't think this is a new issue. We'll take a look at this as well.