Awwnverts

Yeah that's a better explanation than mine lol. I was thinking their were analogous to human blind spots - there's a spot in both eyes where the nerves are and there are no sensors there. Our brains filter that out, but if you get a sheet of paper marked in the right places and hold it at just the right distance, you can see the markings disappear once you put them in your blind spot. The Wiki page for it actually has a version you can do on your device.

In fact, the pseudopupil is a different type of eye altogether, according to your link, it's essentially just a light sensor and isn't thought to provide an actual image.

The dark pseudopupil is the ommatidium that happen to be pointing towards you, and you are seeing the dark light-absorbing cells at the bottom of them. It doesn’t mean the insect is interested in or paying attention to you. If an insect’s compound eyes aren’t spherical, the pseudopupil will look off-center, making it seem as if they are looking slightly away from you. I especially notice this with praying mantis eyes.