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UE-61810 - additional details

UE-61810 is due to a bug in ExportProperties in Engine\Source\Runtime\Engine\Private\UnrealExporter.cpp: If an array has only default elements at the end, its size isn't serialized so the importer doesn't know about those elements.

A simple way to reproduce it is to:

  • Create a material

  • Add a Layer Blend node to it

  • Add an element to the node Layers

  • Duplicate the node: the duplicate doesn't have that element

This issue affects all parts of the engine using the text exporter, which is used for many copy/paste. As such, and as it doesn't produce any error, it is likely to create lots of hidden bugs in many parts of the engine.

Product Version: UE 4.22
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asked Apr 17 '19 at 12:47 AM in Bug Reports

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