If I create a server side method on a model class as per the docs example, I get warnings when the server starts:
Warning: a callable with the name 'anvil.server_side/app.services.model.my_model.my_method' has already been registered (previously by 'anvil._server.server_method_func' now by 'anvil._server.server_method_func').
They’re an irritation rather than an actual problem but I wouldn’t expect to see warnings as a result of following the docs.