diff --git a/test/src/sdk-harness/test_artifacts/tx_contract/src/main.sw b/test/src/sdk-harness/test_artifacts/tx_contract/src/main.sw
index 5755298265c..44593f43781 100644
--- a/test/src/sdk-harness/test_artifacts/tx_contract/src/main.sw
+++ b/test/src/sdk-harness/test_artifacts/tx_contract/src/main.sw
@@ -16,23 +16,23 @@ use std::{
 
 abi TxContractTest {
     fn get_tx_type() -> Transaction;
-    fn get_tx_tip() -> u64;
+    fn get_tx_tip() -> Option<u64>;
     fn get_script_gas_limit() -> u64;
-    fn get_tx_maturity() -> u64;
-    fn get_tx_witness_limit() -> u64;
-    fn get_tx_max_fee() -> u64;
-    fn get_tx_script_length() -> u64;
-    fn get_tx_script_data_length() -> u64;
+    fn get_tx_maturity() -> Option<u32>;
+    fn get_tx_witness_limit() -> Option<u64>;
+    fn get_tx_max_fee() -> Option<u64>;
+    fn get_tx_script_length() -> Option<u64>;
+    fn get_tx_script_data_length() -> Option<u64>;
     fn get_tx_inputs_count() -> u64;
     fn get_tx_outputs_count() -> u64;
     fn get_tx_witnesses_count() -> u64;
-    fn get_tx_witness_pointer(index: u64) -> u64;
-    fn get_tx_witness_data_length(index: u64) -> u64;
-    fn get_tx_witness_data(index: u64) -> B512;
-    fn get_tx_script_start_pointer() -> u64;
-    fn get_tx_script_data_start_pointer() -> u64;
+    fn get_tx_witness_pointer(index: u64) -> Option<u64>;
+    fn get_tx_witness_data_length(index: u64) -> Option<u64>;
+    fn get_tx_witness_data(index: u64) -> Option<B512>;
+    fn get_tx_script_start_pointer() -> Option<u64>;
+    fn get_tx_script_data_start_pointer() -> Option<u64>;
     fn get_tx_id() -> b256;
-    fn get_tx_script_bytecode_hash() -> b256;
+    fn get_tx_script_bytecode_hash() -> Option<b256>;
 
     fn get_input_type(index: u64) -> Input;
     fn get_tx_input_pointer(index: u64) -> u64;
@@ -58,25 +58,25 @@ impl TxContractTest for Contract {
     fn get_tx_type() -> Transaction {
         tx_type()
     }
-    fn get_tx_tip() -> u64 {
-        tx_tip().unwrap()
+    fn get_tx_tip() -> Option<u64> {
+        tx_tip()
     }
     fn get_script_gas_limit() -> u64 {
         script_gas_limit()
     }
-    fn get_tx_maturity() -> u64 {
-        tx_maturity().unwrap()
+    fn get_tx_maturity() -> Option<u32> {
+        tx_maturity()
     }
-    fn get_tx_witness_limit() -> u64 {
-        tx_witness_limit().unwrap()
+    fn get_tx_witness_limit() -> Option<u64> {
+        tx_witness_limit()
     }
-    fn get_tx_max_fee() -> u64 {
-        tx_max_fee().unwrap()
+    fn get_tx_max_fee() -> Option<u64> {
+        tx_max_fee()
     }
-    fn get_tx_script_length() -> u64 {
+    fn get_tx_script_length() -> Option<u64> {
         tx_script_length()
     }
-    fn get_tx_script_data_length() -> u64 {
+    fn get_tx_script_data_length() -> Option<u64> {
         tx_script_data_length()
     }
     fn get_tx_inputs_count() -> u64 {
@@ -88,29 +88,40 @@ impl TxContractTest for Contract {
     fn get_tx_witnesses_count() -> u64 {
         tx_witnesses_count()
     }
-    fn get_tx_witness_pointer(index: u64) -> u64 {
-        tx_witness_pointer(index)
+    fn get_tx_witness_pointer(index: u64) -> Option<u64> {
+        let ptr = tx_witness_pointer(index);
+        if ptr.is_none() {
+            return None
+        }
+
+        Some(asm(r1: ptr.unwrap()) { r1: u64 })
     }
-    fn get_tx_witness_data_length(index: u64) -> u64 {
+    fn get_tx_witness_data_length(index: u64) -> Option<u64> {
         tx_witness_data_length(index)
     }
-    fn get_tx_witness_data(index: u64) -> B512 {
+    fn get_tx_witness_data(index: u64) -> Option<B512> {
         tx_witness_data(index)
     }
-    fn get_tx_script_start_pointer() -> u64 {
-        asm(ptr: tx_script_start_pointer()) {
-            ptr: u64
+    fn get_tx_script_start_pointer() -> Option<u64> {
+        let ptr = tx_script_start_pointer();
+        if ptr.is_none() {
+            return None
         }
+
+        Some(asm(r1: ptr.unwrap()) { r1: u64 })
     }
-    fn get_tx_script_data_start_pointer() -> u64 {
-        asm(r1: tx_script_data_start_pointer()) {
-            r1: u64
+    fn get_tx_script_data_start_pointer() -> Option<u64> {
+        let ptr = tx_script_data_start_pointer();
+        if ptr.is_none() {
+            return None
         }
+
+        Some(asm(r1: ptr.unwrap()) { r1: u64 })
     }
     fn get_tx_id() -> b256 {
         tx_id()
     }
-    fn get_tx_script_bytecode_hash() -> b256 {
+    fn get_tx_script_bytecode_hash() -> Option<b256> {
         tx_script_bytecode_hash()
     }
     fn get_tx_input_pointer(index: u64) -> u64 {
diff --git a/test/src/sdk-harness/test_projects/script_bytecode/src/main.sw b/test/src/sdk-harness/test_projects/script_bytecode/src/main.sw
index 68a45321117..2d9b577e1e9 100644
--- a/test/src/sdk-harness/test_projects/script_bytecode/src/main.sw
+++ b/test/src/sdk-harness/test_projects/script_bytecode/src/main.sw
@@ -15,7 +15,7 @@ impl Hash for [u64; 35] {
 
 fn main() -> b256 {
     // length of return array is script length padded to nearest full word
-    let script_bytecode: [u64; 35] = tx_script_bytecode();
+    let script_bytecode: [u64; 35] = tx_script_bytecode().unwrap();
 
     // Return the hash of the bytecode to compare
     sha256(script_bytecode)
diff --git a/test/src/sdk-harness/test_projects/script_data/src/main.sw b/test/src/sdk-harness/test_projects/script_data/src/main.sw
index e61c4f7a205..b31962c175c 100644
--- a/test/src/sdk-harness/test_projects/script_data/src/main.sw
+++ b/test/src/sdk-harness/test_projects/script_data/src/main.sw
@@ -4,13 +4,13 @@ use std::tx::tx_script_data;
 
 fn main() {
     // Reference type
-    let received: b256 = tx_script_data();
+    let received: b256 = tx_script_data().unwrap();
     let expected: b256 = 0xef86afa9696cf0dc6385e2c407a6e159a1103cefb7e2ae0636fb33d3cb2a9e4a;
     log(received);
     assert(received == expected);
 
     // Copy type
-    let received: u64 = tx_script_data();
+    let received: u64 = tx_script_data().unwrap();
     let expected: u64 = 17259675764097085660;
     log(received);
     assert(received == expected);
diff --git a/test/src/sdk-harness/test_projects/tx_fields/mod.rs b/test/src/sdk-harness/test_projects/tx_fields/mod.rs
index 1eb4dda1a61..19f98a9965b 100644
--- a/test/src/sdk-harness/test_projects/tx_fields/mod.rs
+++ b/test/src/sdk-harness/test_projects/tx_fields/mod.rs
@@ -1,5 +1,5 @@
 use fuel_vm::fuel_crypto::Hasher;
-use fuel_vm::fuel_tx::{Bytes32, ConsensusParameters, ContractId, Input as TxInput};
+use fuel_vm::fuel_tx::{ConsensusParameters, ContractId, Input as TxInput};
 use fuels::types::transaction_builders::TransactionBuilder;
 use fuels::{
     accounts::{predicate::Predicate, wallet::WalletUnlocked, Account},
@@ -220,7 +220,16 @@ mod tx {
             .await
             .unwrap();
 
-        assert_eq!(result.value, tip);
+        assert_eq!(result.value, Some(tip));
+
+        let no_tip = contract_instance
+            .methods()
+            .get_tx_tip()
+            .call()
+            .await
+            .unwrap();
+
+        assert_eq!(no_tip.value, None);
     }
 
     #[tokio::test]
@@ -251,7 +260,16 @@ mod tx {
             .call()
             .await
             .unwrap();
-        assert_eq!(result.value, maturity);
+        assert_eq!(result.value, Some(maturity as u32));
+
+        // Assert none is returned with no maturity
+        let no_maturity = contract_instance
+            .methods()
+            .get_tx_maturity()
+            .call()
+            .await
+            .unwrap();
+        assert_eq!(no_maturity.value, None);
     }
 
     #[tokio::test]
@@ -266,7 +284,7 @@ mod tx {
             .call()
             .await
             .unwrap();
-        assert_eq!(result.value, script_length);
+        assert_eq!(result.value, Some(script_length));
     }
 
     #[tokio::test]
@@ -281,7 +299,7 @@ mod tx {
             .call()
             .await
             .unwrap();
-        assert_eq!(result.value, script_data_length);
+        assert_eq!(result.value, Some(script_data_length));
     }
 
     #[tokio::test]
@@ -368,7 +386,7 @@ mod tx {
             .await
             .unwrap();
 
-        assert_eq!(response.value, 11024);
+        assert_eq!(response.value, Some(11024));
     }
 
     #[tokio::test]
@@ -382,7 +400,7 @@ mod tx {
             .await
             .unwrap();
 
-        assert_eq!(result.value, 64);
+        assert_eq!(result.value, Some(64));
     }
 
     #[tokio::test]
@@ -402,7 +420,7 @@ mod tx {
             .take_receipts_checked(None)
             .unwrap();
 
-        assert_eq!(receipts[1].data().unwrap(), witnesses[0].as_vec());
+        assert_eq!(receipts[1].data().unwrap()[8..72], *witnesses[0].as_vec());
     }
 
     #[tokio::test]
@@ -418,7 +436,7 @@ mod tx {
             .call()
             .await
             .unwrap();
-        assert_eq!(result.value, script_start_offset as u64);
+        assert_eq!(result.value, Some(script_start_offset as u64));
     }
 
     #[tokio::test]
@@ -445,7 +463,7 @@ mod tx {
             .call()
             .await
             .unwrap();
-        assert_eq!(Bytes32::from(result.value.0), hash);
+        assert_eq!(result.value.unwrap(), Bits256(*hash));
     }
 
     #[tokio::test]
@@ -478,7 +496,7 @@ mod tx {
             .call()
             .await
             .unwrap();
-        assert_eq!(result.value, 10392)
+        assert_eq!(result.value, Some(10392))
     }
 }