It could be that. I looked in to a few days ago. What happens is that Youtube puts formatting characters in the form of HTML entities into the <title> tag in head, for some reason. When you just paste a link without adding an anchor, a script will pull the contents of <title> and make that the anchor. These entities are not parsed at all in the forum, and show up as you see them.
What I think might be happening is that the ampersand bug strikes first, turning the & into "& amp ;" (without the spacebars) so the entire entity becomes "& amp ; #x202a;" This is obviously not parsed, and when our hack steps in to correct the ampersand bug, the moment has passed.
Let me see if we can hack that away manually. I'll bring it up.