Invalid instruction data when doing native SOL lock

[kstep]

I'm trying to transfer wrapped SOLs from Solana to Ethereum via Wormhole v1.

I issue the transaction with the instructions:

        let instructions = vec![
            spl_token::instruction::approve(
                &spl_token::id(),
                &source,
                &self.solana_bridge.bridge_key(),
                &self.solana_fee_payer.pubkey(),
                &[],
                amount,
            )?,
            system_instruction::transfer(
                &self.solana_fee_payer.pubkey(),
                &self.solana_bridge.bridge_key(),
                self.solana_bridge.transfer_fee(),
            ),
            self.solana_bridge.lock(
                &self.solana_fee_payer.pubkey(),
                &source,
                &source_token,
                asset_meta,
                ETHEREUM_CHAIN_ID,
                amount,
                target_address,
            ),
        ];

The self.solana_bridge.lock() method creates the following instruction:

Instruction {
    program_id: 5gQf5AUhAgWYgUCt9ouShm9H7dzzXUsLdssYwe5krKhg,
    accounts: [
        AccountMeta {
            pubkey: 5gQf5AUhAgWYgUCt9ouShm9H7dzzXUsLdssYwe5krKhg,
            is_signer: false,
            is_writable: false,
        },
        AccountMeta {
            pubkey: 11111111111111111111111111111111,
            is_signer: false,
            is_writable: false,
        },
        AccountMeta {
            pubkey: TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA,
            is_signer: false,
            is_writable: false,
        },
        AccountMeta {
            pubkey: SysvarRent111111111111111111111111111111111,
            is_signer: false,
            is_writable: false,
        },
        AccountMeta {
            pubkey: SysvarC1ock11111111111111111111111111111111,
            is_signer: false,
            is_writable: false,
        },
        AccountMeta {
            pubkey: Sysvar1nstructions1111111111111111111111111,
            is_signer: false,
            is_writable: false,
        },
        AccountMeta {
            pubkey: 8TCF4CB3LFDjvqUEQUVotRzVtFY4HfpYk1GDxZb4GYy9,
            is_signer: false,
            is_writable: true,
        },
        AccountMeta {
            pubkey: 7HZaCWazgTuuFuajxaaxGYbGnyVKwxvsJKue1W4Nvyro,
            is_signer: false,
            is_writable: false,
        },
        AccountMeta {
            pubkey: D9XNKpfQzNzMUMxYyAquGPjzJfGuA9wn5TJTs1Ahe4EV,
            is_signer: false,
            is_writable: true,
        },
        AccountMeta {
            pubkey: So11111111111111111111111111111111111111112,
            is_signer: false,
            is_writable: true,
        },
        AccountMeta {
            pubkey: GpJabmtpUa7dfE5FStpLAFXWRMSUVEWW7S4LJN3bXCM8,
            is_signer: true,
            is_writable: true,
        },
        AccountMeta {
            pubkey: 2knA92YRuseDFSW9stXPR92BxWzrr6jRyxVD6bkrXLzU,
            is_signer: false,
            is_writable: true,
        },
    ],
   data: [ ... ]

Where data is:

TransferOutPayload {
    amount: 1000000000,
    _pad: [
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
    ],
    chain_id: 2,
    asset: AssetMeta {
        address: [
            6,
            155,
            136,
            87,
            254,
            171,
            129,
            132,
            251,
            104,
            127,
            99,
            70,
            24,
            192,
            53,
            218,
            196,
            57,
            220,
            26,
            235,
            59,
            85,
            152,
            160,
            240,
            0,
            0,
            0,
            0,
            1,
        ],
        chain: 1,
        decimals: 0,
    },
    target: [
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        163,
        223,
        230,
        179,
        163,
        65,
        179,
        241,
        2,
        39,
        63,
        16,
        142,
        7,
        239,
        105,
        239,
        197,
        15,
        55,
    ],
    nonce: 376394881,
}

I get the following error:

[2021-07-19T06:15:22Z DEBUG solana_client::rpc_client] -32002 Transaction simulation failed: Error processing Instruction 2: invalid instruction data
[2021-07-19T06:15:22Z DEBUG solana_client::rpc_client]   1: Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA invoke [1]
[2021-07-19T06:15:22Z DEBUG solana_client::rpc_client]   2: Program log: Instruction: Approve
[2021-07-19T06:15:22Z DEBUG solana_client::rpc_client]   3: Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA consumed 2439 of 200000 compute units
[2021-07-19T06:15:22Z DEBUG solana_client::rpc_client]   4: Program TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA success
[2021-07-19T06:15:22Z DEBUG solana_client::rpc_client]   5: Program 11111111111111111111111111111111 invoke [1]
[2021-07-19T06:15:22Z DEBUG solana_client::rpc_client]   6: Program 11111111111111111111111111111111 success
[2021-07-19T06:15:22Z DEBUG solana_client::rpc_client]   7: Program 5gQf5AUhAgWYgUCt9ouShm9H7dzzXUsLdssYwe5krKhg invoke [1]
[2021-07-19T06:15:22Z DEBUG solana_client::rpc_client]   8: Program log: Error: InvalidInstructionData
[2021-07-19T06:15:22Z DEBUG solana_client::rpc_client]   9: Program 5gQf5AUhAgWYgUCt9ouShm9H7dzzXUsLdssYwe5krKhg consumed 3444 of 200000 compute units
[2021-07-19T06:15:22Z DEBUG solana_client::rpc_client]  10: Program 5gQf5AUhAgWYgUCt9ouShm9H7dzzXUsLdssYwe5krKhg failed: invalid instruction data

Feel free to ask questions and addition info.