DiscreteDelay error from nengolib in nengo_dl

Traceback (most recent call last):
  File "/home/justus/OneDrive/Projects/snn_mpc/learn_predictive_model.py", line 242, in <module>
    main()
  File "/home/justus/OneDrive/Projects/snn_mpc/learn_predictive_model.py", line 88, in main
    test_output = evaluate(
  File "/home/justus/OneDrive/Projects/snn_mpc/learn_predictive_model.py", line 215, in evaluate
    sim = nengo_dl.Simulator(network.model, seed=seed, minibatch_size=batch_size, dt=dt)
  File "/home/justus/nengo-dl/nengo_dl/simulator.py", line 525, in __init__
    self._build_keras(progress)
  File "/home/justus/anaconda3/envs/nengo/lib/python3.9/site-packages/nengo/utils/magic.py", line 181, in __call__
    return self.wrapper(self.__wrapped__, self.instance, args, kwargs)
  File "/home/justus/nengo-dl/nengo_dl/simulator.py", line 50, in with_self
    output = wrapped(*args, **kwargs)
  File "/home/justus/nengo-dl/nengo_dl/simulator.py", line 548, in _build_keras
    outputs = self.tensor_graph(inputs, stateful=self.stateful, progress=progress)
  File "/home/justus/anaconda3/envs/nengo/lib/python3.9/site-packages/tensorflow/python/keras/engine/base_layer.py", line 969, in __call__
    return self._functional_construction_call(inputs, args, kwargs,
  File "/home/justus/anaconda3/envs/nengo/lib/python3.9/site-packages/tensorflow/python/keras/engine/base_layer.py", line 1107, in _functional_construction_call
    outputs = self._keras_tensor_symbolic_call(
  File "/home/justus/anaconda3/envs/nengo/lib/python3.9/site-packages/tensorflow/python/keras/engine/base_layer.py", line 840, in _keras_tensor_symbolic_call
    return self._infer_output_signature(inputs, args, kwargs, input_masks)
  File "/home/justus/anaconda3/envs/nengo/lib/python3.9/site-packages/tensorflow/python/keras/engine/base_layer.py", line 880, in _infer_output_signature
    outputs = call_fn(inputs, *args, **kwargs)
  File "/home/justus/anaconda3/envs/nengo/lib/python3.9/site-packages/tensorflow/python/autograph/impl/api.py", line 645, in wrapper
    return func(*args, **kwargs)
  File "/home/justus/nengo-dl/nengo_dl/tensor_graph.py", line 483, in call
    self.op_builder.build_pre(self.signals, build_config, sub)
  File "/home/justus/nengo-dl/nengo_dl/builder.py", line 70, in build_pre
    self.op_builds[ops].build_pre(signals, config)
  File "/home/justus/nengo-dl/nengo_dl/process_builders.py", line 463, in build_pre
    self.built_process.build_pre(signals, config)
  File "/home/justus/nengo-dl/nengo_dl/process_builders.py", line 293, in build_pre
    steps = [
  File "/home/justus/nengo-dl/nengo_dl/process_builders.py", line 294, in <listcomp>
    op.process.make_step(
TypeError: make_step() got an unexpected keyword argument 'state'