Attached UDN thread and user's project nail the issue down really well.
I am not able to find world outliner how to enable it?
Delay nodes occasionally don't fire the "Completed" output in a nativized build
Undefined sysmbol: typeinfo for AActor when cross-compile linux dedicated server on windows
I can't open my map from the editor.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-21977 in the post.