Transactions sent in parallel don't work

[th7nder]

    tokio::join!(
        register_storage_provider(client.clone(), charlie_kp.clone()),
        set_porep_verifying_key(
            client.clone(),
            charlie_kp.clone(),
            VerifyingKey::from_raw_bytes(porep_vk_scale),
        ),
        set_post_verifying_key(
            client.clone(),
            charlie_kp.clone(),
            VerifyingKey::from_raw_bytes(post_vk_scale),
        ),
        // Deal collateral + pre_commit_deposit (1)
        add_balance(client.clone(), charlie_kp.clone(), 12_500_000_001),
        add_balance(client.clone(), alice_kp.clone(), 25_000_000_0000),
    );

2025-01-24T13:45:59.819538Z DEBUG register_storage_provider{address="5FLSigC9HGRKVhB9FiEo4Y3koPsNmBmLJbpXg2mp1hXcS59Y"}: storagext::runtime::client: Waiting for finalization, Previous nonce: 0, next nonce: 0
2025-01-24T13:46:00.825749Z DEBUG set_porep_verifying_key{address="5FLSigC9HGRKVhB9FiEo4Y3koPsNmBmLJbpXg2mp1hXcS59Y"}: storagext::runtime::client: Waiting for finalization, Previous nonce: 0, next nonce: 0
2025-01-24T13:46:01.831169Z DEBUG set_post_verifying_key{address="5FLSigC9HGRKVhB9FiEo4Y3koPsNmBmLJbpXg2mp1hXcS59Y"}: storagext::runtime::client: Waiting for finalization, Previous nonce: 0, next nonce: 0
2025-01-24T13:46:02.835048Z DEBUG add_balance{address="5FLSigC9HGRKVhB9FiEo4Y3koPsNmBmLJbpXg2mp1hXcS59Y" amount=12500000001}: storagext::runtime::client: Waiting for finalization, Previous nonce: 0, next nonce: 0
2025-01-24T13:46:06.250544Z DEBUG add_balance{address="5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY" amount=250000000000}: storagext::runtime::client: Waiting for finalization, Previous nonce: 0, next nonce: 0

It probably has to do with our mechanism of setting nonces.
We're depending on the nonce returned from the:

        let current_nonce = self
            .legacy_rpc
            .system_account_next_index(&account_keypair.account_id())
            .await?;

It's related to: paritytech/subxt#1886 and #651 .