Your brain is not immune to the problem, it's just hard to automate the creation of optical (and audio, and presumably all other sensory) illusions when we don't have a synapse resolution connectome of the relevant bits of your brain.
Examples include That Dress, duck-or-rabbit, stereotypes, "garden path sentences", and most film special effects.
Ironically your second link starts with Clever Hans, which is another example of my point. Machines, even organic ones like our brains, are not magically able to know objective reality, and the failure itself isn't idiocy — the rate of failure (and things like metecognition about the possibility of failure) is (at last part of) the intelligence-idiocy spectrum.
