[Iris]: Creating a custom net serializer, would love to use the "ReplicationSystemTestPlugin" framework to test serialization

If you have access to p4, it should be possible to use the automation test framework that is used by the the tests in //UE5/Main/EngineTest/Source/EngineTest/Networking. A little bit more involved, but it should be possible to exercise properties using your custom NetSerializer that way.