cant see mesh

I am generating a mesh with custom amount of sub-divisions, known as side length in the code, when I click on the mesh filter I see that the amount of vertices, triangles and uvs, but no mesh, not even in wireframe, here is the code if you need to see it, it is executable in edit mode

 using System.Collections.Generic;
 using UnityEngine;
 
 [ExecuteInEditMode]
 public class TerrainObj : MonoBehaviour
 {
     [SerializeField] private List<int> Triangles;
     private Mesh mesh;
     [Range(3, 9999)]
     [SerializeField] private int sideLength;
     [SerializeField] private bool generateNewMesh;
     [SerializeField] private List<Vector3> Vertices;
     [SerializeField] private List<Vector2> UVs;
 
     private void Awake()
     {
         sideLength = 2;
         GetComponent<MeshFilter>().mesh = new Mesh();
         mesh = GetComponent<MeshFilter>().sharedMesh;
     }
 
     private void Update()
     {
         if (generateNewMesh == true) Generate();
     }
 
     private void Generate()
     {
         generateNewMesh = false;
         Triangles = new List<int>();
         Vertices = new List<Vector3>();
         UVs = new List<Vector2>();
 
         for (int x = 0; x < sideLength; x++)
         {
             for (int z = 0; z < sideLength; z++)
             {
                 Vertices.Add(new Vector3(x, 0, z));
 
                 Triangles.Add(x + z);
                 Triangles.Add(x + (z + 1));
                 Triangles.Add((x + 1) + z);
 
                 Triangles.Add(x + (z + 1));
                 Triangles.Add((x + 1) + z);
                 Triangles.Add((x + 1) + (z + 1));
                 Debug.Log("E");
             }
         }
 
         foreach(Vector3 vec in Vertices)
         {
             UVs.Add(new Vector2(vec.x, vec.z));
         }
 
         UpdateMesh();
     }
 
     private void UpdateMesh()
     {
         mesh.Clear();
         mesh.SetVertices(Vertices);
         mesh.SetTriangles(Triangles, 0);
         mesh.SetUVs(0, UVs);
     }
 }