I'm no expert on such matters, but I would imagine so. If the 'overlooked' contents of the WM go mouldy after a few days, the spores or whatever must have come from somewhere - and fairly unlikely to have 'got into' a closed machine during those few days. After a sufficiently hot wash, some of the spores which were in the garments/whatever will still be there, but will have hopefully been killed (not guaranteed with some of 'em devils!), so did not ought to be able to result in mould. However, as I said, I can't vouch for that.
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