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I don't know, I've been trying to figure it out too. I opened an issue on github about it, if you've got any insights as to why it's happening, feel free to join in on the bug report.

i figured it out from your comments on github... im not on there so ill post h ere.

It comes from having any character, then multiple GT block quote symbols.

so this is fine:

jesta opened an issue on github

NM except now i can't reproduce i t.