AssertionError in Graph Mode with Slice Operation on `nn.ParameterList`

import oneflow as flow
import oneflow.nn as nn

class SimpleModel(nn.Module):
    def __init__(self):
        super().__init__()
        self.params = nn.ParameterList([
            nn.Parameter(flow.randn(64, 128)),
            nn.Parameter(flow.randn(32, 64)), 
            nn.Parameter(flow.randn(16, 32))
        ])
    
    def forward(self, x):
        # This slice operation fails in Graph mode
        return self.params[::2][0] + x

# Test data
x = flow.randn(64, 128)
model = SimpleModel()

# Eager mode works
print("Eager mode result:", model(x))

# Graph mode fails
class TestGraph(nn.Graph):
    def __init__(self, model):
        super().__init__()
        self.model = model
        
    def build(self, x):
        return self.model(x)

g = TestGraph(model)
print("Graph mode result:", g(x))

[ERROR](GRAPH:TestGraph_0:TestGraph) building graph got error.
Traceback (most recent call last):
  File "test_script.py", line 34, in <module>
    print("Graph mode result:", g(x))
  ...
  File "test_script.py", line 15, in forward
    return self.params[::2][0] + x
  File "/home/miniconda3/envs/oneflow-test/lib/python3.10/site-packages/oneflow/nn/graph/proxy.py", line 767, in __getitem__
    assert isinstance(idx, int)
AssertionError