When I created a new wallet using their own seed standard (not bip39), I noticed that they didn't ask me which derivation path ( I wasn't able to choose Legacy). So I tried to import that new Seed into a new Electrum wallet. Look what I found:
I was confused when I saw this, to know if Electrum has changed the version number system, but nothing like that. I have just generated Electrum legacy address using the console and I import it, it worked and it generated legacy address
If it is BIP39 seed phrase, Electrum would bring the option to select the derivation path that you want to use. If it is Electrum seed phrase, there won't be anything like that because the seed phrase for address types on Electrum are different as a result of version number.
Read about it here:
Electrum Seed Version System