REGRESSION: No, this occurs as far back as 4.16.
Crash occurs when the user changes a variable type from Object Reference to Actor Soft Object Reference.
RESULT
Crash.
Fatal error: [File:D:\Framework\Engine\Source\Runtime\CoreUObject\Private\Templates\Casts.cpp] [Line: 10] Cast of StaticMesh /Game/Environments/Props/Boxes/Meshes/AmmoCrate_Closed.AmmoCrate_Closed to Actor failed UE4Editor_CoreUObject!CastLogError() casts.cpp:11 UE4Editor_PropertyEditor!CastChecked<AActor,UObject>() casts.h:217 UE4Editor_PropertyEditor!SPropertyEditorAsset::OnGetAssetName() spropertyeditorasset.cpp:631 UE4Editor_PropertyEditor!TMemberFunctionCaller<SPropertyEditorAsset,FText() delegateinstanceinterface.h:165 UE4Editor_PropertyEditor!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SPropertyEditorAsset,FText() tuple.h:497 UE4Editor_PropertyEditor!TBaseSPMethodDelegateInstance<1,SPropertyEditorAsset,0,FText __cdecl() delegateinstancesimpl.h:327 UE4Editor_Slate!TBaseDelegate<FText>::Execute() delegatesignatureimpl.inl:537 UE4Editor_Slate!TAttribute<FText>::Get() attribute.h:137 UE4Editor_Slate!FTextBlockLayout::ComputeDesiredSize() textblocklayout.cpp:48 UE4Editor_Slate!STextBlock::ComputeDesiredSize() stextblock.cpp:186 UE4Editor_SlateCore!SWidget::CacheDesiredSize() swidget.cpp:519 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_SlateCore!SWidget::SlatePrepass() swidget.cpp:502 UE4Editor_PropertyEditor!SListView<TSharedRef<FDetailTreeNode,0> >::GenerateWidgetForItem() slistview.h:1016 UE4Editor_PropertyEditor!SListView<TSharedRef<FDetailTreeNode,0> >::ReGenerateItems() slistview.h:911 UE4Editor_Slate!STableViewBase::Tick() stableviewbase.cpp:249 UE4Editor_PropertyEditor!STreeView<TSharedRef<FDetailTreeNode,0> >::Tick() streeview.h:466 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:873 UE4Editor_SlateCore!SOverlay::OnPaint() soverlay.cpp:97 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:899 UE4Editor_SlateCore!SPanel::PaintArrangedChildren() spanel.cpp:31 UE4Editor_SlateCore!SPanel::OnPaint() spanel.cpp:12 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:899 UE4Editor_SlateCore!SCompoundWidget::OnPaint() scompoundwidget.cpp:35 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:899 UE4Editor_SlateCore!SPanel::PaintArrangedChildren() spanel.cpp:31 UE4Editor_SlateCore!SPanel::OnPaint() spanel.cpp:12 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:899 UE4Editor_Slate!SBox::OnPaint() sbox.cpp:245 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:899 UE4Editor_SlateCore!SPanel::PaintArrangedChildren() spanel.cpp:31 UE4Editor_SlateCore!SPanel::OnPaint() spanel.cpp:12 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:899 UE4Editor_SlateCore!SCompoundWidget::OnPaint() scompoundwidget.cpp:35 UE4Editor_Slate!SBorder::OnPaint() sborder.cpp:85 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:899 UE4Editor_SlateCore!SPanel::PaintArrangedChildren() spanel.cpp:31 UE4Editor_SlateCore!SPanel::OnPaint() spanel.cpp:12 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:899 UE4Editor_SlateCore!SCompoundWidget::OnPaint() scompoundwidget.cpp:35 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:899 UE4Editor_SlateCore!SCompoundWidget::OnPaint() scompoundwidget.cpp:35 UE4Editor_Slate!SBorder::OnPaint() sborder.cpp:85 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:899 UE4Editor_SlateCore!SOverlay::OnPaint() soverlay.cpp:97 UE4Editor_SlateCore!SWidget::Paint() swidget.cpp:899 UE4Editor_SlateCore!SPanel::PaintArrangedChildren() spanel.cpp:31
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-50703 in the post.