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It didn't disappear.
The NSFW tag hides the preview because it's displaying sensitive content. In this case nudity.
Imagine one Hive parent somewhere in the world scrolling through his/her Hive feed with his/her child on his/her lap and finding your post. Lot's of explanations to give in a Christmas evening...

I really don't think that photograph would require a lot of explanations, but then again, rules are rules. Okay, I understand, apologies again. I will try to keep that in mind.

Merry Christmas!

No need to apologize at all.
Perhaps I should be the one doing it for all the "stalking" tonight, but I am only trying to point you in the right direction, saving you some time and headaches.

Merry Christmas!