I've got a 4306, and while it never leaked, the bottom door gasket did seem to chemically melt over the years.
I replaced it a few months ago. I don't know that a steam vent is needed as the gasketing system never allows any steam pressure to build. And, if anything, in general, the gaskets are in worse shape now than when the dishwasher was new, so leakage due to steam pressure would have been greater when new.
Testimonial: "I was suspecting degraded gasket and seems like there is precedence."
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