I’m an architect. Dissimilar metals in direct contact with each other result in something called Galvanic Action…In simple terms, two dissimilar metals in the presence of moisture can cause one metal to corrode the other. For the technically minded, it’s the same process as electrolysis, and this tendency in metals is used to galvanize steel for protection.
It’s described in the codes, and is generally not recommended without adequate neutral separation, however specifications can vary.