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That's weird. Maybe it's some one time glitch. I thought maybe it's when played on 60 Hz screen. I have a 144 Hz, so the timesteps are smaller and the character can move ever slightly closer to the edge. But I changed my refresh rate to 60 FPS and had no issue crossing this gap :/

If you've used delta time in your movement calculations, I don't think the frame rate will matter. But anyways, if it works for most of the people it fine.