added a test for storage of a zero

contracts/issues/Ndev3234.sol

@@ -0,0 +1,12 @@
+pragma solidity 0.8.12;
+
+contract saveZeros {
+
+    bytes32[64] public b;  // prefills the contract storage
+    uint256 public number;
+
+
+    function saveZero() public {  // should not create a new account
+        number = 0;
+    }
+}

integration/tests/neon_evm/bugs/test_storage_cell_zero.py

@@ -0,0 +1,47 @@
+from solana.keypair import Keypair
+
+from integration.tests.neon_evm.utils.contract import deploy_contract
+from integration.tests.neon_evm.utils.neon_api_client import NeonApiClient
+from utils.evm_loader import EvmLoader
+from utils.solana_client import SolanaClient
+from utils.types import Contract, Caller, TreasuryPool
+
+
+class TestStorageCells:
+    def test_zeros(
+        self,
+        operator_keypair: Keypair,
+        user_account: Caller,
+        evm_loader: EvmLoader,
+        treasury_pool: TreasuryPool,
+        neon_api_client: NeonApiClient,
+        sol_client: SolanaClient,
+    ):
+        # Deploy the contract
+        contract: Contract = deploy_contract(
+            operator=operator_keypair,
+            user=user_account,
+            contract_file_name="issues/Ndev3234.sol",
+            evm_loader=evm_loader,
+            treasury_pool=treasury_pool,
+            contract_name="saveZeros",
+            version="0.8.12",
+        )
+
+        emulate_result_do_nothing_1 = neon_api_client.emulate_contract_call(
+            sender=user_account.eth_address.hex(),
+            contract=contract.eth_address.hex(),
+            function_signature="doNothing()",
+        )
+        accounts_after_deploy = len(emulate_result_do_nothing_1["solana_accounts"])
+        print(f"Accounts after deploy: {accounts_after_deploy}")
+
+        # Emulate storing zero
+        emulate_result_zero = neon_api_client.emulate_contract_call(
+            sender=user_account.eth_address.hex(),
+            contract=contract.eth_address.hex(),
+            function_signature="saveZero()",
+        )
+
+        accounts_after_storing_zero = len(emulate_result_zero["solana_accounts"])
+        assert accounts_after_storing_zero == accounts_after_deploy