Just tried using it for the first time. I wrote some text, highlighted it, then hit the spoiler button. What I saw was this:
Don’t show this
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Looks different in replies vs posts.
spoiler
Don’t show this
Yep, doesn’t work.
spoiler
_test don’t show this
spoiler
Test spoiler
I noticed this yesterday when posting on /c/Haruhi Indeed, pretty annoying.