If you call Montage_SetEndDelegate after a montage has begun blending out, but before it terminates, the end delegate will not be set because an active montage instance cannot be found. If an AI is killed during this time the behavior tree will be cleared, but the delegate can't be, which gets called with invalid memory and can crash. 

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By Design
ComponentOLD - Anim
Affects Versions4.23
CreatedJan 7, 2020
ResolvedJan 8, 2020
UpdatedOct 27, 2020