802.11b HR/DSSS modulation not working

examples/routing/manet-routing-compare.cc no longer works. When running it with NS_LOG=WifiPhy, it reports Unsupported modulation received (HR/DSSS), consider as noise. Although both DSSS and HR/DSSS are added earlier as an allowed modulation type, the value DSSS is the maximum supported modulation class when the check is made. I don't see calls to SetMaxModulationClassSupported() outside of emlsr-manager.cc.