I am not a brain in a jar. I am the being who is monitoring all of your brains in jars.
A simplified response to this type of question (very simplified) is that is does not matter. Either you are a brain in a jar experiencing reality as you know it, and you will at some point experience that your brain is in a jar, or you won't. The analogy is the sleeping/waking question. Once you wake up, you know for sure you were asleep so the question is answered. If one were to never wake up then the entirety of their existence would be experienced asleep, and their complete reality would consist of the experiences therein, i.e. the fact that they are actually a brain in a jar has no effect on their experience of reality an a non-brain-jar-being.
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