My experience is much like that of am_Unition. I work with a lot of white males but do/have worked with people from around the world. My experiences all feel like anecdotes.
Working with someone non-white doesn't seem to change my world view, at least not so simply. For example, one China-born coworker is a poor engineer. A couple others are superb engineers. That alone doesn't change my worldview much. What stands out to me is working with not just someone born in a different country of a different ethnicity but also working with someone with a similar background to me: white, male, grew up a hundred or so miles of here and went to university in state. And then they're a lousy engineer. Others are great engineers.
I'm not sure what that means for you. I guess, it's just as useful to me to work with "peers" that are terrible as it is to work with someone "different" who is really good.
Do your students do report outs or presentations to the class? As a white person, I think working with a group of white people but seeing a group of Indian or Chinese or Middle Eastern classmates give a good presentation would expand my experience more than a more diverse project team. In a project team, the dominant personality, regardless of ethnicity, will dominate.