I have had this happen a couple of times in an Aegon's conquest scenario. It announces a new Dragon rider and then sequentially announces a number of different riders with the same dragon, then it stops. I have only seen this when an existing dragon gets a rider, not an egg hatching. This happened twice more before stopping. Additionally Baelax now has Blackfyre. I am sure if any true Targaryens are left as the Baraytheons inherited the iron throne.
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