I've tried m/84'/0'/0' , m/84'/0'/0'/0' , and m/84'/0'/0'/0 with valid Electrum segwit and BIP39 mnemonic "abandon about razor", but I'm not getting the same result as Electrum (bc1qp0efh7jms7f580e7nnywjg5vzm90njm0rdvqpe for index 0). Everything matches the results from BIP84 in Ian Coleman, so I'm not sure what's going wrong here.