To provide some clarity on this, it's not specifically coded into the system to prefer one particular browser over another, but rather, it's independent of all browsers and using the useragent as a string as part of a group.

Chrome could equally be as effected by this as any other browser.

You're getting downvoted, but I was thinking the same thing. Could someone explain why that might not be the case?

If that's an A/B test where user agents are randomly added to either control or a test group, and you change your user agent, then you are reassigned, because you changed the user agent