fix: eth: return the correct nonce from EthGetTransactionCount

EVM contracts track this number internally.

fixes https://github.com/filecoin-project/lotus/issues/10255

node/impl/full/eth.go

@@ -31,6 +31,7 @@ import (
 	"github.com/filecoin-project/lotus/build"
 	"github.com/filecoin-project/lotus/chain/actors"
 	builtinactors "github.com/filecoin-project/lotus/chain/actors/builtin"
+	builtinevm "github.com/filecoin-project/lotus/chain/actors/builtin/evm"
 	"github.com/filecoin-project/lotus/chain/ethhashlookup"
 	"github.com/filecoin-project/lotus/chain/events/filter"
 	"github.com/filecoin-project/lotus/chain/messagepool"
@@ -367,6 +368,29 @@ func (a *EthModule) EthGetTransactionCount(ctx context.Context, sender ethtypes.
 		return ethtypes.EthUint64(0), xerrors.Errorf("cannot parse block param: %s", blkParam)
 	}
 
+	// First, handle the case where the "sender" is an EVM actor.
+	actor, err := a.StateManager.LoadActor(ctx, addr, ts)
+	if err != nil {
+		if xerrors.Is(err, types.ErrActorNotFound) {
+			return 0, nil
+		}
+		return 0, xerrors.Errorf("failed to lookup contract %s: %w", sender, err)
+	}
+
+	if builtinactors.IsEvmActor(actor.Code) {
+		evmState, err := builtinevm.Load(a.Chain.ActorStore(ctx), actor)
+		if err != nil {
+			return 0, xerrors.Errorf("failed to load evm state: %w", err)
+		}
+		if alive, err := evmState.IsAlive(); err != nil {
+			return 0, err
+		} else if !alive {
+			return 0, nil
+		}
+		nonce, err := evmState.Nonce()
+		return ethtypes.EthUint64(nonce), err
+	}
+
 	nonce, err := a.Mpool.GetNonce(ctx, addr, ts.Key())
 	if err != nil {
 		return ethtypes.EthUint64(0), nil