This is a very slight yet somewhat annoying bug: on the world loading screen, a small dot that looks like a particle from a dirt block appears for a fraction of a second, then disappears. It flickers like this several times. I could not get a screenshot of it, but I have supplied an image of the position of the dot.
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Yes, I am using a Chromebook, but it runs fine.
chromebook isn't an officially supported device. see Can Minecraft Run on Chromebook for more info