Unable to get "maxFeePerGas" and "maxPriorityFeePerGas" for BNB chain

[EricxStone]

Ethers Version

6.15.0

Search Terms

BNB Chain, maxFeePerGas, maxPriorityFeePerGas

Describe the Problem

Unable to get maxFeePerGas and maxPriorityFeePerGas for BNB chain. The values returned are null. This issue only happens on BNB chain but not other major chains like Ethereum, Base, etc. It is not RPC specific too.

The fee data returned:

FeeData {
  gasPrice: 100000000n,
  maxFeePerGas: null,
  maxPriorityFeePerGas: null
}

If I downgrade the lib to Ethers v5, I am able to get the value.

{
  lastBaseFeePerGas: BigNumber { _hex: '0x00', _isBigNumber: true },
  maxFeePerGas: BigNumber { _hex: '0x59682f00', _isBigNumber: true },
  maxPriorityFeePerGas: BigNumber { _hex: '0x59682f00', _isBigNumber: true },
  gasPrice: BigNumber { _hex: '0x05f5e100', _isBigNumber: true }
}

Code Snippet

This is how I get the fee data:

const provider = new providers.StaticJsonRpcProvider({url, timeout}, parseInt("56"));
const gasFeeData: FeeData = await provider.getFeeData();

Contract ABI

Errors

Environment

node.js (v12 or newer)

Environment (Other)

No response

[Rustix69]

@EricxStone Can I try to work on this issue ??