How to add alpha cutout shader to this curveworld shader

I got the curveworld shader from a youtube tutorial and it works just fine but i have a texture that needs alpha cutout when i add this shader it looks like the picture plss i need help. thank you in advance for helping me.

this is the shader

 Shader "Custom/Bendy diffuse - Radial"
 {

 Properties
 {
     _Color ("Main Color", Color) = (1,1,1,1)
     _MainTex ("Albedo", 2D) = "white" {}
 }
 SubShader 
 {

     Tags { "RenderType"="Opaque" }
     LOD 200
     
     CGPROGRAM

     #pragma surface surf Lambert vertex:vert addshadow
 

     uniform half3 _CurveOrigin;
     uniform fixed3 _ReferenceDirection; 
     uniform half _Curvature;
     uniform fixed3 _Scale; 
     uniform half _FlatMargin;
     uniform half _HorizonWaveFrequency;

     sampler2D _MainTex;
     fixed4 _Color;

     struct Input 
     {
         float2 uv_MainTex;
     };

     half4 Bend(half4 v)
     {
     half4 wpos = mul(unity_ObjectToWorld, v);

     half2 xzDist = (wpos.xz - _CurveOrigin.xz) / _Scale.xz;
     half dist = length(xzDist);

     half2 direction = lerp(_ReferenceDirection.xz, xzDist, min(dist, 1));

     half theta = acos(clamp(dot(normalize(direction), _ReferenceDirection.xz), -1, 1));

     dist = max(0, dist - _FlatMargin);

     //wpos.y -= dist * dist * _Curvature * cos(theta * _HorizonWaveFrequency);
     wpos.x += dist * dist * _Curvature * cos(theta * _HorizonWaveFrequency);


     wpos = mul (unity_WorldToObject, wpos);

     return wpos;
     }

     void vert (inout appdata_full v)
     {
     half4 vpos = Bend(v.vertex);

     v.vertex = vpos;
     }

     void surf (Input IN, inout SurfaceOutput o)
     {
     fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
     o.Albedo = c.rgb;
     o.Alpha = c.a; 
     }

     ENDCG
 }


 FallBack "Legacy Shaders/Diffuse"
 }