I just took 3.0 for a test drive and imported to a empty project, then resetting preferred types to default and exporting AOTClasses.cs I get tons of compiler errors like
1
AssetsAOTClasses.cs(68,9):error CS0509:'AOTDummy.NodeCanvas_Framework_ExposedParameter_System_Boolean':cannot derive from sealed type'ExposedParameter<bool>'
and
1
AssetsAOTClasses.cs(533,9):error CS0718:'NavMesh':statictypes cannot be used astype arguments