Foundry: Deployment fail without --slow flag when sending multiple transactions sequentially

[zsystm]

Reproduction Steps

1. Run a local evmd node (Reference: GUIDE.md)
2. Attempt to deploy multiple contracts in a single script without using the --slow flag

forge script script/DeployUniswapV3.s.sol --rpc-url $RPC_URL --broadcast --chain-id $CHAIN_ID

Observed Behavior

• Without the --slow flag, the deployment fails with a nonce mismatch error.
• Transactions are sent too quickly without waiting for previous transactions to be mined and confirmed.
• As a result, the nonces in subsequent transactions are not aligned properly.

Logs

Error: Failed to send transaction

Context:
- server returned an error response: error code -32000: invalid nonce; got 50, expected 49: invalid sequence: invalid sequence

Additional Information

• The --slow flag ensures that each transaction is only sent after the previous one has been confirmed and succeeded.

• From forge --help:

    --slow
      Makes sure a transaction is sent, only after its previous one has been confirmed and succeeded

Notes

• When sending multiple transactions in a single script (such as deploying Uniswap V3 contracts), the --slow flag is mandatory.