Great question — answering as the UphillTech team:
It is absolutely safe to do so... For most foods, I would say that there is no reason not to. If they are savory muffins like corn muffins to be served with the roast, I would not hesitate at all. For sweet goods, with a high amount of butter or oil, there is some small risk of absorbing aromas. I would generally segregating strongly aromatic foods for baked goods. The foil should mitigate most of the possible transfer, but I wouldn't try it for the first time with guests.
Full answer by SAJ14SAJ: https://cooking.stackexchange.com/a/43179 (CC BY-SA 3.0).
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