Very well. Again, many thanks!

Great. Many thanks! What would be the easiest way to report further issues? (Another answer on this thread, a comment on this answer,...?)

:-)${}{}{}{}{}$

"I suspect that people are doing this as an extension of the fact that they don't like the MO question that this meta question is about."

Not really.${}$

(Why the rudeness? Please remove the quotation marks.)

Sure, Yemon, we are all expecting to be reasonable.

@GeoffDalgas Compare line 3 in the actual post (left) with line 3 in the preview (right). After the $\mathbb T=$ on the left there is a $z$, while on the preview on the right there is a $\{z$. Same with the $\}$: It appears on the preview and not on the actual post. (Strange, though: I was sure when I looked at the source earlier, there was only { rather than \{, etc, and I reported accordingly. It appears I was mistaken. Sorry about the confusion.)