Objects such as 'Oumuamua, Borisov and recently 3I/ATLAS have opened our eyes to the reality that outsiders regularly visit our solar system — and we're about to start spotting a whole lot more of them.
https://www.space.com/astronomy/comets/interstellar-visitors-like-comet-3i-atlas-are-the-most-common-objects-in-the-milky-way-theres-almost-always-one-within-the-solar-system
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“These sorts of interstellar objects are the most common macroscopic objects in the galaxy,” Chris Lintott, a professor of astrophysics at the University of Oxford, said during the meeting. “The fact that we’ve only found three of them is quite fun.”
Doesn’t sound that common to me then