I was just trying to clean up Understanding why $\pi_{3}(N) = \mathbb{Z}_{(2n, n^2)}$? , which was originally almost entirely cut-and-pasted images without any alternate text. For the first image, I gave it the alternate text:

Arkowitz and Golasinski - Co-$H$ structures on Moore spaces of type $(G, 2)$, p. 673

This worked fine in the preview, but, when I posted the change, everything after the first dollar sign (including the trailing /> of whatever HTML is generated by the Markdown processor) had escaped into the text of the post. Since my instinct was to leave a clean post, I fixed it (removed the dollar signs) and didn't get a screen shot, so I'm afraid I can't document beyond just this description of what happened. (Because I did it within the grace period, I think that the original error won't even show up in the revision history; and it seems that editing again just to artificially re-insert, and then fix, the error would not be appropriate.)

Why does the preview handle this correctly, but not the main post?

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    $\begingroup$ This bug report by Glorfindel (on Meta Stack Exchange) seems related: MathJax wrongly rendered when used as alt text for image $\endgroup$ – Martin Sleziak Oct 2 at 3:20
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    $\begingroup$ @MartinSleziak, in fact, it seems identical. Shall I close as duplicate? (I feel like we've had this exchange about a previous bug report of mine that was also duplicate before, but I don't remember and can't immediately find the result ….) $\endgroup$ – LSpice Oct 2 at 3:21
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    $\begingroup$ You can't close a question as a cross-site duplicate, it's fine to leave it open. I'll link your question in my bug report, so that the developers can mark it status-completed when they get to it. $\endgroup$ – Glorfindel Oct 2 at 5:49

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