Custom shaded objects react to lighting on the wrong objects

Unity Engine
1

I’ve written the following shader, and I don’t understand why every object with this shader receives lighting when another object does.

Shader "Ghost/Photophobia" {
    Properties {
        _Texture ("Texture (RGB)", 2D) = "white" {}
    }
    SubShader {
        Tags {
            "Queue" = "Transparent"
        }
        Pass {            
            Blend SrcAlpha OneMinusSrcAlpha
            
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_builtin_noshadows
            #pragma fragmentoption ARB_fog_exp2
            #pragma fragmentoption ARB_precision_hint_fastest
            
            #include "UnityCG.cginc"
            #include "AutoLight.cginc"
            
            struct v2f {
                V2F_POS_FOG;
                LIGHTING_COORDS
                float2 uv;
                float3 lightDir;
                float3 normal;
            };
            
            float4 _Texture_ST;
            
            v2f vert (appdata_tan v) {
                v2f o;
                PositionFog(v.vertex, o.pos, o.fog);
                o.normal = v.normal;
                o.uv = TRANSFORM_TEX(v.texcoord, _Texture);
                o.lightDir = ObjSpaceLightDir(v.vertex);
                TRANSFER_VERTEX_TO_FRAGMENT(o);
                return o;
            }
            
            sampler2D _Texture;
            
            half4 frag (v2f i) : COLOR {
                half4 textureColor = tex2D(_Texture, i.uv);
                half4 c = DiffuseLight( i.lightDir, i.normal, textureColor, LIGHT_ATTENUATION(i) );
                c.a = -((c.r + c.b + c.g) / 3) + 1;
                return c;
            }
            ENDCG
        }
    }
}

In the image below, there is a sphere and a capsule with my shader applied (they each have a red and green texture). When I shine the spot light on either cube (default diffuse shader), the same sized spot shows up on the sphere and the capsule in the same relative location.

I get nothing when shining light on the sphere or the capsule directly. What am I doing wrong?

2

Can you recreate this behaviour in a new scene?

3

Yep.

EDIT: In fact, here’s a reduced case in a whole new project. If you have both a scene and a game view, you can see what’s happening quite easily by translating the cube.

184214–6542–$photophobia_595.zip (1.07 MB)