It needs to be either supported, or UBlackboardData should not show up in lists of valid parent classes. I'm not sure the latter is possible at all, so we should at least patch it up so that that runtime check doesn't fail anymore. It basically fails due to double-registering same ufunction for some broadcast delegate.

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ComponentUE - AI
Target Fix4.9
Fix Commit2573959
CreatedJun 15, 2015
ResolvedJul 15, 2015
UpdatedApr 27, 2018