yitay: The Aruch HaShulchan only agrees with the Chamudei Doniel by a dry, solid object. He writes that Rotev is instant. Zei’a is similar to Rotev as in the end of Siman 92
I don’t understand why we wouldn’t suspect that the walls of the microwave are full of Bliyos, just like we do with any pot. Again Zei’a is equivalent to being full of liquid. Additionally, it has been hit by months of repeated Zei’a and even w/o the Taz’s Iruim Harbeh, there is much more than a ????.