`forge script` fails with deserialization error on `reth` nodes with blobs disabled

[javadkh2]

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

1.3.2-stable

What version of Foundryup are you on?

1.3.0

What command(s) is the bug in?

forge script

Operating System

macOS (Apple Silicon)

Describe the bug

Running forge script on a reth client with blobs disabled fails because blobGasUsedRatio contains null instead of numbers.

Steps to Reproduce

1. Create a genesis.json with blobs disabled, e.g.:

{
  "config": {
    "chainId": 1789,
    "homesteadBlock": 0,
    "eip155Block": 0,
    "eip158Block": 0,
    "londonBlock": 0,
    "mergeForkBlock": 0,
    "cancunTime": 0,
    "pragueTime": 0,
    "blobSchedule": {
      "cancun": {"baseFeeUpdateFraction": 3338477, "max": 0, "target": 0},
      "prague": {"baseFeeUpdateFraction": 5007716, "max": 0, "target": 0}
    }
  },
  "nonce": "0x0",
  "timestamp": "0x0",
  "gasLimit": "0x1c9c380",
  "difficulty": "0x0",
  "alloc": {}
}

2. Run the reth node:

docker run -v /Users/javad/Projects/kadena-evm-sandbox/genesis.json:/chain-config/genesis.json -p 8545:8545  --rm  ghcr.io/paradigmxyz/reth node --chain /chain-config/genesis.json --http --http.addr 0.0.0.0 --http.api all

3. Run any Forge script:

forge script script/Counter.s.sol:CounterScript \
  --private-key <your-private-key> \
  --broadcast

Expected Behavior

Forge should handle null values in blobGasUsedRatio gracefully when blobs are disabled.

Actual Behavior

Error: Failed to get EIP-1559 fees; deserialization error: invalid type: null, expected f64 at line 1 column 254
{"baseFeePerGas":["0x7","0x7","0x7","0x7","0x7","0x7","0x7","0x7","0x7","0x7","0x7"],"gasUsedRatio":[0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0],"baseFeePerBlobGas":["0x1","0x1","0x1","0x1","0x1","0x1","0x1","0x1","0x1","0x1","0x1"],"blobGasUsedRatio":[null,null,null,null,null,null,null,null,null,null],"oldestBlock":"0x20b","reward":[["0x0"],["0x0"],["0x0"],["0x0"],["0x0"],["0x0"],["0x0"],["0x0"],["0x0"],["0x0"]]}

Environment

Forge: 1.3.2-stable
Reth: 1.6.0

Workaround

using legacy transaction (--legacy flag)

[mattsse]

hmm, are you sure that response is coming from reth?

because the ratio there isn't an option:

https://github.com/alloy-rs/alloy/blob/db0aa6a0a1e2678994ed66d2cafe8049cbd4c7d5/crates/rpc-types-eth/src/fee.rs#L58-L61

could you perhaps share an example feehistory json response?

EDIT: I cant reproduce this on reth which sends

        "blobGasUsedRatio": [
            0
        ]

with that genesis

[javadkh2]

This was a bug in the old reth client (v1.6.0). The latest version has fixed this issue and works as expected.

[javadkh2]

paradigmxyz/reth#17669