I think I found the error:

1.19 (working):

////// Emissive:
float node_1237 = (1.0-max(0,dot(normalDirection, viewDirection)));
float3 emissive = (_node_1172.rgb*node_1237);
float3 finalColor = emissive;
fixed4 finalRGBA = fixed4(finalColor,node_1237);
UNITY_APPLY_FOG(i.fogCoord, finalRGBA);
return finalRGBA;
}

1.24 (not working):

////// Emissive:
float4 node_1237 = (1.0-max(0,dot(normalDirection, viewDirection)));
float3 emissive = (_node_1172.rgb*node_1237);
float3 finalColor = emissive;
fixed4 finalRGBA = fixed4(finalColor,node_1237);
UNITY_APPLY_FOG(i.fogCoord, finalRGBA);
return finalRGBA;
}

No chance of fix?