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Try View > Preview on CPU
That fixed it.
GPU is fast, but sacrifices precision for that.
When zooming in very close, we've seen that quite a few times reported on the forums.
Yes, this void looks a bit like some debate that occured on some TV channels yesterday.
Which version of Illustrator are you using?
Obviously, your actual zoom level is enormous. Does using the View on CPU option in the View menu change something?