From what I've read, it's mysterious. The only time it has happened to me was a bag of rebatch (not mine, purchased) that I forgot about. I found it on the shelf after about 6 or 8 months, and there were definite orange bits, slightly slimy, on the shreds. It seems that it can happen quickly or after a long time. I'm guessing that being encased in plastic, humid, and no circulation is what did it for the shreds.
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