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Resistant does not mean it can’t get moldy. Just less likely if treated well.
All wooden boards need to be cleaned and well dried before storage to prevent mildew and warping. I wash both sides of my thicker boards even if I just used one so that it doesn’t warp while drying. Also I dry them standing on edge so it dries evenly. Just a longevity thing if you spent good money for a good board. If it’s a $5 board from Walmart, do whatever, just be clean.
I have also had this dream.