[tor-relays] Is there any problems for users of my exit node if I have DNS lookups go out on a different interface?

I plan to set up a Tor exit node (again), and the server has two external interfaces each with a dedicated IP. I'm going to use one of these exclusively for Tor.

I also run a validating Unbound on the same machine, and all DNS lookups that are not cached will go out on the *other* interface by default.

internet <--> IP 1 <--> unbound internet <--> IP 2 <--> tor, talking locally to unbound

IP 1 and 2 should have the same routing path otherwise, because it's on the same network.

I can't imagine how this could be problematic, but there has been so much talk about DNS lookups over the years, so I thought I'd better check with people who know more about this.