I can't see any reason you would have water pipe in the attic. I suspect it's more likely excess humidity spray getting up there. You could try taping(masking tape) a garbage bag to the ceiling to block the spray to test that theory.
If that's the case, the issue is that type of ceiling treatment probably shouldn't be used in the bathroom unprotected. If it were me, I'd go over it with some sort of water resistant paint. That's just guessing looking at it though.
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