fix decode_unchecked bug

crates/pvm-contract-types/src/lib.rs

@@ -1458,7 +1458,7 @@ impl<T: SolArrayElement + StaticDecode + StaticEncodedLen, const N: usize> Stati
                         as usize;
                     unsafe { T::decode_unchecked(input, offset + field_offset) }
                 } else {
-                    unsafe { T::decode_unchecked(input, i * T::SLOT_SIZE) }
+                    unsafe { T::decode_unchecked(input, offset + i * T::SLOT_SIZE) }
                 }
             };
 
@@ -1604,4 +1604,16 @@ impl_tuple_sol!((0: A), (1: B), (2: C), (3: D), (4: E), (5: F), (6: G), (7: H_),
 impl_tuple_sol!((0: A), (1: B), (2: C), (3: D), (4: E), (5: F), (6: G), (7: H_), (8: I), (9: J), (10: K), (11: L));
 
 #[cfg(test)]
-mod tests;
+mod tests {
+    use super::*;
+
+    #[test]
+    fn decode_unchecked_failure() {
+        let mut buf = [0; 256];
+        (10u32, [5u32, 10]).encode_to(&mut buf);
+        assert_eq!(
+            unsafe { <(u32, [u32; 2])>::decode_unchecked(&buf, 0) },
+            (10u32, [5u32, 10])
+        );
+    }
+}