The first thing that SelectParams does is call SelectBaseParams. Therefore, we do not need to call SelectBaseParams immediately prior to calling SelectParams.

src/chainparams.cpp

@@ -369,7 +369,6 @@ bool SelectParamsFromCommandLine()
     if (network == CBaseChainParams::MAX_NETWORK_TYPES)
         return false;
 
-    SelectBaseParams(network);
     SelectParams(network);
     return true;
 }