Have one of my passthrough doors that started to do that in two locations on the door. It is a chemical reaction in the fiberglass panel, I believe. You can do nothing but try to get replacement doors and good luck with that. Just another one of those keystone issues or the manufacturer of the panels being used.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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