fix: accept missing mix hashes in remote blocks (#516)

* fix: accept missing mix hashes in remote blocks

* Create modern-ways-wash.md

* Add TODO about missing mix_hash

Author: fvictorio

.changeset/modern-ways-wash.md

@@ -0,0 +1,5 @@
+---
+"@nomicfoundation/edr": patch
+---
+
+Fixed a problem that prevented forking chains without mix hash fields in their blocks

crates/edr_evm/src/block/remote.rs

@@ -178,7 +178,9 @@ impl IntoRemoteBlock<L1ChainSpec> for edr_rpc_eth::Block<edr_rpc_eth::Transactio
             gas_used: self.gas_used,
             timestamp: self.timestamp,
             extra_data: self.extra_data,
-            mix_hash: self.mix_hash.ok_or(CreationError::MissingMixHash)?,
+            // TODO don't accept remote blocks with missing mix hash,
+            // see https://github.com/NomicFoundation/edr/issues/518
+            mix_hash: self.mix_hash.unwrap_or_default(),
             nonce: self.nonce.ok_or(CreationError::MissingNonce)?,
             base_fee_per_gas: self.base_fee_per_gas,
             withdrawals_root: self.withdrawals_root,