Holes in Occlusion Culling a transparent object

I am trying to write a shader uses proper occlusion culling. But I get these transparent blocks within the texture.

The normals are facing out and UV's are not overlapping.

I just want to know what I should be looking for in solutions. I'm out of ideas what it could be.

 Shader "Custom/YellingTransparent" {
         Properties
         {
             _MainTex("Texture", 2D) = "white" {}
         _InnerColor("Inner Color", Color) = (1.0, 1.0, 1.0, 1.0)
             _RimColor("Rim Color", Color) = (0.26,0.19,0.16,0.0)
             _RimPower("Rim Power", Range(0.5,8.0)) = 3.0
         }
             SubShader
         {
             Tags{ "Queue" = "Transparent" }
             //Cull Front
             Cull Back
             Blend One One
             ZWrite On
             LOD 200
             CGPROGRAM
 #pragma surface surf Lambert
 
             struct Input
         {
             float2 uv_MainTex;
             float3 viewDir;
         };
 
         sampler2D _MainTex;
         float4 _InnerColor;
         float4 _RimColor;
         float _RimPower;
 
             void surf(Input IN, inout SurfaceOutput o)
         {
             o.Albedo = tex2D(_MainTex, IN.uv_MainTex).rgba * _InnerColor;
             half rim = 1.0 - saturate(dot(normalize(IN.viewDir), o.Normal));
             o.Emission = _RimColor.rgba * pow(rim, _RimPower);
         }
         ENDCG
         }
             Fallback "Diffuse"
     }