UUserDefinedStruct assets are automatically nativized.
UUserDefinedStruct assets are automatically nativized even when blueprint nativization option is Exclusive, and no assets are specified for Blueprint Nativization.
The following is how to reproduce this bug(or is it intended?)
I was able to reproduce the behavior you mentioned and have logged a report for it here: https://issues.unrealengine.com/issue/UE-52556 . I noticed that unlike other blueprints, the Structure blueprint does not have a "nativize" checkbox, so nativizing the blueprint by default may be intended behavior.
answered Nov 20 '17 at 03:54 PM
Follow this question
Once you sign in you will be able to subscribe for any updates here