A couple of times now, I've been entering a large matrix here or on math.SE and, in the preview window, all the rows appear on a single line. Once the question posts, it displays correctly. I most recently ran into this bug on this question.

I'm afraid this is somewhat of a Heisenbug: I just tried to reproduce by (1) editing my question, (2) copy-pasting my equation into a new ask box and (3) manually copy-typing the matrix into a new ask box, and none of them reproduced the bug. It has happened to me a few times now, though.

Has anyone else seen this? Does anyone have a reliable way to reproduce it?

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    $\begingroup$ On my smartphone, posts with matrices sometimes appear as a single line before being rerendered correctly which can take several seconds for me. This might be a browser dependent issue. Gerhard "So Do Some More Testing" Paseman, 2020.02.11. $\endgroup$ – Gerhard Paseman Feb 11 at 17:09
  • $\begingroup$ Not only in large matrices, but also in multi-line displayed formulae. The problem seems to be intermittent (it occurs on some occasions but not always). Triple slash is the way to force the (approximately) correct behavior (if it switches to working correctly, you just have an extra space in your formula, which screws up alignment a bit but still preserves readability) $\endgroup$ – fedja Feb 12 at 23:31
  • $\begingroup$ Is there a reason the meta tag marking-preview doesn't fit and justifies creation of preview? cf chat.stackexchange.com/transcript/message/53575574#53575574 $\endgroup$ – YCor 7 hours ago
  • $\begingroup$ @YCor The tag suggestion box didn't offer marking-preview as a suggestion to me. I changed it to marking-preview now but, in fact, it appears to be the only question with that tag. $\endgroup$ – David E Speyer 6 hours ago
  • $\begingroup$ In chat, markdown-preview is suggested but (1) there don't appear to be any questions with that tag either and (2) the part of the question inside TeX is supposed to be ignored by the markdown parser, so that this shouldn't be a question about markdown (although I wouldn't be surprised if the cause is a bug with the markdown parser.) Anyway, I'll leave the tags alone for now, but I think preview actually was the best name. $\endgroup$ – David E Speyer 6 hours ago
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    $\begingroup$ I find [marking-preview] completely uninformative. [preview] or [markdown-preview] would be better. $\endgroup$ – David Roberts 5 hours ago
  • $\begingroup$ I have edited it to (markdown-preview) - the same name is used on many other metas. (For example, Meta Stack Exchange, Mathematics Meta). Once this is resolved and some name for this tag is agreed, I suppose that the comments here which are related to the creation of the new tag could be deleted. (We can discuss further in chat.) $\endgroup$ – Martin Sleziak 4 hours ago

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