can I use ns3::PropagationDelayModel in LTE model?

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"LTE and NR do not handle propagation delay either", I conducted tests in ns-3 and observed that the pointer "enbLteDevs->GetObject<LteEnbNetDevice>()->GetPhy()->GetDownlinkSpectrumPhy()->GetChannel()->GetPropagationDelayModel()" eventually returns a null result. Therefore, I attempted to extract the LTE default channel and assign a simple model such as "ConstantSpeedPropagationDelayModel" (which is commonly used in Wi-Fi). However, I found that this caused problems in channel establishment, such as errors like msg="Error, called SetPropagationDelayModel() twice" and cond="rbNum == (*itPss).nRB".

I would like to consult: Is the configuration of propagation delay models for LTE and NR not very feasible? And if it is feasible, how should it be implemented?