Why does this happen?
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Your plate isn't microwave safe
My guess would be the plate has absorbed moisture so now has an ability to absorb microwaves.
This happens most notably when I reheat soup in a ceramic bowl. I suppose the paint isn't safe then?
To test if a bowl or plate is microwave safe, put a glass of water and the object under test into the microwave and run for a minute. The bowl/plate should be cold. If it's warmed up, it is not microwave safe.
I do think it has something to go with the glaze they use, but it's been a minute since I researched it.