Premultiplied alpha shader drawing a texture

TexturePremul.shader

Shader "Unlit/TexturePremul" {
    Properties {
        _MainTex ("Texture", 2D) = "white" {}
    }
    SubShader {
        Tags { "RenderType"="Transparent" "Queue"="Transparent" }
        Pass {
            Blend One OneMinusSrcAlpha // premultiplied alpha
            ZWrite Off
            
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;

            struct MeshData {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct Interpolators {
                float4 vertex : SV_POSITION;
                float2 uv : TEXCOORD0;
            };

            Interpolators vert (MeshData v) {
                Interpolators o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv;
                return o;
            }
            
            float4 frag( Interpolators i ) : SV_Target {
                return tex2D( _MainTex, i.uv );
            }
            
            ENDCG
        }
    }
}