ray: Class attribute in ray actor cannot be accessed/copied

What is the problem?

Ray actor fails to access class attributes.

Ray version and other system information (Python version, TensorFlow version, OS): ray 1.0.0 Python 3.7.7

Reproduction (REQUIRED)

This code is modified from https://github.com/dask/distributed/issues/4233#issue-740152650

from module import Foo
import ray

@ray.remote
class ray_Foo:
    def __init__(self, Foo):
        self.Foo = Foo

    def show(self):
        return self.Foo.bar


ray.init()
foo = Foo()
foo.append(123)
print(foo.show())

ray_foo = ray_Foo.remote(foo)
print(ray.get(ray_foo.show.remote()))

$ cat module.py
class Foo:
    bar = []

    def append(self, value):
        self.bar.append(value)

    def show(self):
        return self.bar

$ python ray_issue_new.py
[123]
[]

If we cannot run your script, we cannot fix your issue.

• I have verified my script runs in a clean environment and reproduces the issue.
• I have verified the issue also occurs with the latest wheels.