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The white sheen on the fruit is a fungus, you get it on grapes too. The larger blobs are the fungus growing on the rotten fruit that is either over ripe or has been damaged.
Probably some sort of brown rot, often the fruit is over-ripe, bruised by wind-damage or split after heavy rain which followed a dry spell (as stated above).
It would help tremendously if rotten or dried plums were not left on the tree because they reinfect fruits the following year. "Mummified" blackened and shrivelled fruits hanging on the tree during the winter, or rotten fruits on the ground, will carry the fungus through to the following season.
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