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Vanilla is killing Santa!
Not only that! Father Christmas and all his entourage gets killed 
I wanted to use the unicode character Father Christmas but it has been stripped off - from the title and the body of the discussions. But I was lucky that I used him as the last character, because it is not only that this unicode character is not shown, also everything that comes after this character is gone.
Look here comes Santa Claus and a Christmas song:
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Comments
Since preview is working, I would guess it is the database format.
Yes, we don't have utf8mb4 enabled on cloud yet for sites that predated that core change.