diff --git a/accounts/abi/bind/backends/simulated.go b/accounts/abi/bind/backends/simulated.go
index 441849c20f..d7c74f65fe 100644
--- a/accounts/abi/bind/backends/simulated.go
+++ b/accounts/abi/bind/backends/simulated.go
@@ -79,7 +79,7 @@ type SimulatedBackend struct {
 // A simulated backend always uses chainID 1337.
 func NewSimulatedBackendWithDatabase(database ethdb.Database, alloc core.GenesisAlloc, gasLimit uint64) *SimulatedBackend {
 	genesis := core.Genesis{
-		Config:   params.AllEthashProtocolChanges,
+		Config:   params.BorUnittestChainConfig,
 		GasLimit: gasLimit,
 		Alloc:    alloc,
 	}
diff --git a/core/chain_makers.go b/core/chain_makers.go
index ab35f5f67f..3c43c9d86a 100644
--- a/core/chain_makers.go
+++ b/core/chain_makers.go
@@ -135,15 +135,6 @@ func (b *BlockGen) AddTx(tx *types.Transaction) {
 // the block in chain will be returned.
 func (b *BlockGen) AddTxWithChain(bc *BlockChain, tx *types.Transaction) {
 	b.addTx(bc, vm.Config{}, tx)
-	b.statedb.SetTxContext(tx.Hash(), len(b.txs))
-
-	receipt, err := ApplyTransaction(b.config, bc, &b.header.Coinbase, b.gasPool, b.statedb, b.header, tx, &b.header.GasUsed, vm.Config{}, nil)
-	if err != nil {
-		panic(err)
-	}
-
-	b.txs = append(b.txs, tx)
-	b.receipts = append(b.receipts, receipt)
 }
 
 // AddTxWithVMConfig adds a transaction to the generated block. If no coinbase has
diff --git a/core/state_transition.go b/core/state_transition.go
index 89d572bebf..95e668abe0 100644
--- a/core/state_transition.go
+++ b/core/state_transition.go
@@ -459,7 +459,7 @@ func (st *StateTransition) TransitionDb(interruptCtx context.Context) (*Executio
 
 	if rules.IsLondon {
 		burntContractAddress := common.HexToAddress(st.evm.ChainConfig().Bor.CalculateBurntContract(st.evm.Context.BlockNumber.Uint64()))
-		burnAmount := new(big.Int).Mul(new(big.Int).SetUint64(st.gasUsed()), st.evm.Context.BaseFee)
+		burnAmount = new(big.Int).Mul(new(big.Int).SetUint64(st.gasUsed()), st.evm.Context.BaseFee)
 
 		if !st.noFeeBurnAndTip {
 			st.state.AddBalance(burntContractAddress, burnAmount)