Small open rectangle on my screen

I noticed a small open rectangle at the bottom right side of my mac book pro screen. It's about 5 mm long and less than 1 mm wide. I can’t capture this with my mouse and it doesn’t appear to have any obvious reason for being there …. Has anyone else seen this on their computer or can tell me what this might be due to?

Answer this question I have this problem too

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Can you take a picture of it with your phone or camera then paste the image here so we can see it.

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