Same happens to me. The problem is in FBlueprintEditorUtils::ValidateEditorOnlyModules() (BlueprintEditorUtils.cpp) where this warning message is printed if node is in editor-only package and NOT in “uncooked-only” or “developer”. Since “developer” is already deprecated, the solution is to set the module as “uncooked-only”.
In my case, I’ve added:
OverridePackageType = PackageOverrideType.GameUncookedOnly;
to module-rules constructor in <module-name>.Build.cs.
Hope this helps.
2 Likes