It’s just so unlikely for all the factors to line up perfectly for it to happen, and then stay there. The object’s speed, direction of travel, distance, etc would all have to be perfect. It would also be competing with the moon, which is a major factor.
Edit – removed article that I linked about a small object in THE SAME orbit as Earth’s (not orbiting earth) and misremembered what I had read when I used it as a source.
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