An increasing amount of warning show up in the output log as a widget is pasted into a name space that is part of a widget that has been added to another widget via the user created section.
Example warnings:
LogUObjectHash: Warning: Ambiguous search, could be CanvasPanel /Game/Widget1.Widget1:WidgetTree.CanvasPanel_0 or CanvasPanel /Game/Widget1.SKEL_Widget1_C:WidgetTree.CanvasPanel_0 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanel /Game/Widget1.Widget1:WidgetTree.CanvasPanel_0 or CanvasPanel /Game/Widget1.Widget1_C:WidgetTree.CanvasPanel_0 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanel /Game/Widget1.Widget1:WidgetTree.CanvasPanel_0 or CanvasPanel /Game/Widget2.Widget2:WidgetTree.CanvasPanel_0 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanel /Game/Widget1.Widget1:WidgetTree.CanvasPanel_0 or CanvasPanel /Game/Widget2.SKEL_Widget2_C:WidgetTree.CanvasPanel_0 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanel /Game/Widget1.Widget1:WidgetTree.CanvasPanel_0 or CanvasPanel /Game/Widget2.Widget2_C:WidgetTree.CanvasPanel_0 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanel /Game/Widget1.Widget1:WidgetTree.CanvasPanel_0 or CanvasPanel /Engine/Transient.World_2:Widget2_C_0.WidgetTree_0.CanvasPanel_0 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanel /Game/Widget1.Widget1:WidgetTree.CanvasPanel_0 or CanvasPanel /Engine/Transient.World_2:Widget2_C_0.WidgetTree_0.Widget1.WidgetTree_0.CanvasPanel_0 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanel /Game/Widget1.Widget1:WidgetTree.CanvasPanel_0 or CanvasPanel /Engine/Transient.World_2:Widget2_C_1.WidgetTree_0.CanvasPanel_0 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanel /Game/Widget1.Widget1:WidgetTree.CanvasPanel_0 or CanvasPanel /Engine/Transient.World_2:Widget2_C_1.WidgetTree_0.Widget1.WidgetTree_0.CanvasPanel_0 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanelSlot /Game/Widget2.Widget2:WidgetTree.CanvasPanel_0.CanvasPanelSlot_1 or CanvasPanelSlot /Game/Widget2.SKEL_Widget2_C:WidgetTree.CanvasPanel_0.CanvasPanelSlot_1 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanelSlot /Game/Widget2.Widget2:WidgetTree.CanvasPanel_0.CanvasPanelSlot_1 or CanvasPanelSlot /Game/Widget2.Widget2_C:WidgetTree.CanvasPanel_0.CanvasPanelSlot_1 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanelSlot /Game/Widget2.Widget2:WidgetTree.CanvasPanel_0.CanvasPanelSlot_1 or CanvasPanelSlot /Engine/Transient.World_2:Widget2_C_0.WidgetTree_0.CanvasPanel_0.CanvasPanelSlot_1 LogUObjectHash: Warning: Ambiguous search, could be CanvasPanelSlot /Game/Widget2.Widget2:WidgetTree.CanvasPanel_0.CanvasPanelSlot_1 or CanvasPanelSlot /Engine/Transient.World_2:Widget2_C_1.WidgetTree_0.CanvasPanel_0.CanvasPanelSlot_1 LogProperty: Warning: Illegal TEXT reference to a private object in external package (CanvasPanelSlot /Game/Widget2.Widget2:WidgetTree.CanvasPanel_0.CanvasPanelSlot_1) from referencer (Button /Engine/UMG/Editor/Transient.Button_72). Import failed... LogProperty: Warning: ObjectProperty /Script/UMG.Widget:Slot: unresolved reference to 'CanvasPanelSlot'"CanvasPanel_0.CanvasPanelSlot_1"''
Result: Various warnings (see examples in the description) show up in the output log. The number of warnings per pasting of the widget increase if the steps are repeated
Expected: Log would not having increasingly larger amount s of warning fill the output log
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-60160 in the post.