Water on hot plugs should not make them break. I'm not sure which plugs you've got there, but if you have several broken plugs, my guess is they broke when you installed them. The cracks wouldn't show up until they got wet and then the plug would short out through the crack in the insulator.
Make sure you use an actual plug socket to install the plugs. A plug socket has a rubber insert to center the plug and cushion the insulator from being pushed from the side by the socket. It is easy to break an insulator.
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