Sprite make crash when editor startup

Development Programming & Scripting C++
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1

in plugins folder i create NewActor :: AActor,which has a UBillboardComponent.
but when i startup ue editor,it crash:
because when “UUnrealEdEngine::MakeSortedSpriteInfo(SortedSpriteInfo)” first invoked , “TObjectRange()” can’t find this actor. So:(I missed procedure？when i place this actor in normal folder ,not in plugins ,it works…)

![150323-]~]0qkkaxxnn9sa6y_6p@1.png|1213x670

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2

i know,
.uplugin must be this:

"Modules": [
	{
		"Name": "XXX",
		"Type": "Runtime",
		"LoadingPhase": "PreDefault"
	}
]