If an interface contains a virtual function that returns "nullptr", If an interface contains a UFUNCTION that has a TSubclassOf type as a parameter or return value, implementing the interface in a blueprint class that is nativized causes packaging to fail when Nativization Method is set.

Yes - Issue does not occur in 4.15.2 Binary (CL 3416026)
No - This issue can also be reproduced in 4.15.3.

Steps to Reproduce
  1. Download and Unzip attached project
  2. File->Package Project->Windows->64-bit

Package attempt fails

Game packages with nativization set.

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ComponentUE - Gameplay - Blueprint
Affects Versions4.16
Target Fix4.17
Fix Commit3460004
Main Commit3510073
CreatedMay 18, 2017
ResolvedMay 25, 2017
UpdatedApr 27, 2018
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