From a UDN thread:
When cooking, we are seeing hundreds of warnings of the format "Compiler Warning A node that generated no code of it's own ( X ) tried to inject code into Y". There isn't anything that seems obviously wrong with the blueprint logic. The node is often a Select, but sometimes it is a Get or a structure Break. The target is often a Return Node, but sometimes other functions.
I noticed that these warnings only appear when packaging with the new nativize blueprints feature. The simple project I posted ... has a few warnings like this.
I've attached the sample project the user shared.
Cook (with nativization enabled) the the attached project, see the log for warnings:
"A node that generated no code of it's own (@@) tried to inject code into @@. %s"
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-33021 in the post.