Editor crashes when exporting emitters while in PIE

My editor often crashes when I export emitters from one PS to another. It doesn't always happen, but often enough.

MachineId:97DC791B44BA630C9C2F3E898BBD74D4
EpicAccountId:ecf2758a0d1940589a6131f859944a2a

Assertion failed: bIsFirstCreate || NumInstances == NumEmitters [Link Removed] [Line: 4931]

UE4Editor_Core!FDebug::AssertFailed()
UE4Editor_Engine!UParticleSystemComponent::InitParticles()
UE4Editor_Engine!UParticleSystemComponent::InitializeSystem()
UE4Editor_Engine!UParticleSystemComponent::ActivateSystem()
UE4Editor_Cascade!FCascade::ExportSelectedEmitter()
UE4Editor_Cascade!?Execute@?$TBaseSPMethodDelegateInstance@$0A@VFCascade@@$0A@$$A6A?AU?$TTypeWrapper@X@@XZ$$V@@UEBAXXZ()
UE4Editor_Cascade!?ExecuteIfSafe@?$TBaseSPMethodDelegateInstance@$0A@VFCascade@@$0A@$$A6AXXZ$$V@@UEBA_NXZ()
UE4Editor_Slate!FUICommandList::ExecuteAction()
UE4Editor_Slate!SMenuEntryBlock::OnClicked()
UE4Editor_Slate!SMenuEntryBlock::OnMenuItemButtonClicked()
UE4Editor_Slate!??$?R$$V@?$TMemberFunctionCaller@VSMenuEntryBlock@@P81@EAA?AVFReply@@XZ@@QEAA?AVFReply@@XZ()
UE4Editor_Slate!??$ApplyAfter@V?$TMemberFunctionCaller@VSMenuEntryBlock@@P81@EAA?AVFReply@@XZ@@$$V@?$TTupleImpl@U?$TIntegerSequence@I$S@@$$V@@QEBA?AVFReply@@$$QEAV?$TMemberFunctionCaller@VSMenuEntryBlock@@P81@EAA?AVFReply@@XZ@@@Z()
UE4Editor_Slate!?Execute@?$TBaseSPMethodDelegateInstance@$0A@VSMenuEntryBlock@@$0A@$$A6A?AVFReply@@XZ$$V@@UEBA?AVFReply@@XZ()
UE4Editor_Slate!?Execute@?$TBaseDelegate@VFReply@@$$V@@QEBA?AVFReply@@XZ()
UE4Editor_Slate!SButton::OnMouseButtonUp()
UE4Editor_Slate!SMenuEntryButton::OnMouseButtonUp()
UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator()()
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >()
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent()
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent()
UE4Editor_Slate!FSlateApplication::OnMouseUp()
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage()
UE4Editor_Core!FWindowsApplication::DeferMessage()
UE4Editor_Core!FWindowsApplication::ProcessMessage()
UE4Editor_Core!FWindowsApplication::AppWndProc()
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages()
UE4Editor!FEngineLoop::Tick()
UE4Editor!GuardedMain()
UE4Editor!GuardedMainWrapper()
UE4Editor!WinMain()
UE4Editor!__scrt_common_main_seh()
kernel32
ntdll

Run PIE (Any level)
Open two particle systems
Export one emitter from one PS to another
Crash

Fix UE-51650

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