I forgot to mention: in a situation of parallel universes, of course.

And also in a situation of different angles of observation. Maybe your example fits here — with chocolate, which is both tasty and fattening. Or if you want, both tasty and not tasty. What tastes good to me won’t necessarily taste good to you. You probably have better examples. Maybe from an airplane, where things look different than they do from the ground. There was someone who said that the disputes in the Mishnah or in the Talmud aren’t real — meaning they aren’t actually disagreeing. For example, one said "there is a pen here" because that’s what he focused on, and the other said "paper" because that’s what he focused on. Both things were lying on the table; each one just saw something else. Or in a situation where you see only the angle and not the rectangle, and from your point of view you think there is only an angle there — so you’re not mistaken.

*If we ask what the thing really is, then yes, it has one truth.

Parallel universes are just a slogan, and they have nothing to do with the logical plane. There is no possibility of a logical contradiction in any context of discourse whatsoever, scientific or otherwise. Views from different angles, or of different people, are not a contradiction. There is nothing at all special about this in quantum theory. The chocolate example is just from ordinary life, unrelated to quantum theory.