SampleteLevel don't work on ps4

I use SampleLevel to sample texture, it's work on pc, but don't work on ps4. Here is the Script and ComputeShader:

 using System.Collections;
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
 using UnityEngine;
 
 public class CommandBufferTest : MonoBehaviour
 {
     private static int _Map = Shader.PropertyToID("_Map");
     private static int _TestDataBuffer = Shader.PropertyToID("_TestDataBuffer");
 
     public ComputeShader m_shader;
     public RenderTexture m_rt;
 
     private ComputeBuffer m_testDataBuffer;
 
     private TestData[] testDatas = null;
 
     private int k_id;
 
     void Start()
     {
         k_id = m_shader.FindKernel("CSMain");
         m_shader.SetTexture(k_id, _Map, m_rt);
         testDatas = new TestData[1];
         testDatas[0].x = 1;
         int inputSize = Marshal.SizeOf(typeof(TestData));
         m_testDataBuffer = new ComputeBuffer(1, inputSize, ComputeBufferType.Default);
         m_shader.SetBuffer(k_id, _TestDataBuffer, m_testDataBuffer);
 
         m_testDataBuffer.GetData(testDatas);
         Debug.Log(testDatas[0].x);
     }
 
     // Update is called once per frame
     void Update()
     {
         m_shader.Dispatch(k_id, 8, 1, 1);
         m_testDataBuffer.GetData(testDatas);
         Debug.Log(testDatas[0].x);
     }
 
     private void OnGUI()
     {
         GUILayout.Label("buffer_X:" + testDatas[0].x + "|buffer_Y:" + testDatas[0].y + "|buffer_Z" + testDatas[0].z);
     }
 }

===============================================

 #pragma kernel CSMain
 
 
 cbuffer CB
 {
     Texture2D<float4> _Map;
     SamplerState sampler_Map;
 }
 
 struct TestData//for test
 {
     float x;
     float y;
     float z;
 };
 
 RWStructuredBuffer<TestData> _TestDataBuffer;
 
 
 [numthreads(8,1,1)]
 void CSMain (uint3 id : SV_DispatchThreadID)
 {
     TestData a;
     float3 _Color = _Map.SampleLevel(sampler_Map, float2(-0.1,-0.1),0);
     a.x = _Color.r;
     a.y = _Color.g;
     a.z = _Color.b;
     _TestDataBuffer[id.x] = a;
 }
 

I want to know why it don't work on ps4.