fix: Exclude BNB Chain from zero fee configuration in gas fee logic

This commit updates the gas fee configuration logic to accommodate the BNB Chain (chainId 56). While the BNB Network supports EIP-1559, it reports a `baseFeePerGas` of zero. This adjustment ensures that transactions on the BNB Chain do not mistakenly receive a max fee configuration of zero, which is not appropriate despite the reported base fee. This change maintains the functionality for other chains such as Polygon (chainId 137) that require legacy gasPrice fees, and excludes only BNB Chain from the zero max fee logic. This is crucial for proper transaction fee handling on networks supporting EIP-1559 but reporting a base fee of zero.

packages/core/src/internal/execution/jsonrpc-client.ts

@@ -640,7 +640,7 @@ export class EIP1193JsonRpcClient implements JsonRpcClient {
     // We prioritize EIP-1559 fees over legacy gasPrice fees, however,
     // polygon (chainId 137) requires legacy gasPrice fees so we skip EIP-1559 logic in that case
     if (latestBlock.baseFeePerGas !== undefined && chainId !== 137) {
-      if (latestBlock.baseFeePerGas === 0n) {
+      if (latestBlock.baseFeePerGas === 0n && chainId != 56) {
         // Support zero gas fee chains, such as a private instances
         // of blockchains using Besu.
         return {