You were right, Robert. I was storing a key as a StringProperty in the Community.featured_maker. That key was no longer valid on HRD. The key.to_path() didn't help, because the old key was an encoded key from the old appid. I manually looked up the right key and set the featured_maker and now everything seems to be working. I'll have to comb through the rest of the code for any similar cases, but I believe that was the only key in a StringProperty.
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