You dropped it while you were still making it? Did you heat it up to a molten stage and work with it a while after it was dropped? Dropping it could have caused a fracture that would have spread during the heating and cooling of the annealing process. Yellow and orange CAN be a problem if you encase a large quantity without enough clear layers in there, but I doubt that's why. The cracks really don't look like incompatibility to me.
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