According to a tweet yesterday afternoon, from Derrick Riches..
Recall on 2013 Masterbuilt Electric Smokers
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The wood chip tray can fail to slide securely into the smoker, causing the wood to combust and the smoker’s cabinet door to blow open, posing a fire hazard.
Therefore, if you use an AMNPS exclusively, there is no danger. You can't get consistent smoke from burning chips & chunks in the MES drawer anyway.
Just my 2 cents,