type hints with Enum do not work

I found out, that we cannot define READ_WRITE Enum attribute with type hints:

from enum import Enum
from tango.server import Device, attribute
from tango.test_context import DeviceTestContext



class MyEnum(Enum):
    ZERO = 0
    ONE = 1
    TWO = 2


class MyDevice(Device):

    _val = MyEnum.ZERO

    @attribute()
    def enum_attr(self) -> MyEnum:
        return self._val

    @enum_attr.write
    def set_enum_attr(self, new_val):
        self._val = MyEnum(new_val)


if __name__ == '__main__':
    with DeviceTestContext(MyDevice) as test:
        print(test.LensMode)

Does not work, due to "__get_attribute_type_from_hint" is called twice: ones, when we parce read method and the second time, when we parce write method. This leads to call of "set_enum_labels" method of att_prop object. Which, in fact does not set, but append labels (see cppTango#1385 (closed)).