I've had that happen to me; Sometimes you don't notice it, and then the bag of mush falls off the stem. It usually just happens here and there and not on all of them. I never noticed the color but it is gross and stinks too.
I always thought a bug punctured it near the top.
ETA - I've had it happen on tomatoes too although more infrequently and I don't think it ever happened on a hybrid.
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