got rid of the unnecessary tangent normalization. mikkts compliance only requires normalization when converting normal from TS to WS.

ScriptableRenderPipeline/LightweightPipeline/LWRP/ShaderLibrary/Core.hlsl

 
 void OutputTangentToWorld(half4 vertexTangent, half3 vertexNormal, out half3 tangentWS, out half3 binormalWS, out half3 normalWS)
 {
+    // mikkts space compliant. only normalize when extracting normal at frag.
-    tangentWS = normalize(mul((half3x3)UNITY_MATRIX_M, vertexTangent.xyz));
+    tangentWS = TransformObjectToWorldDir(vertexTangent.xyz);
     binormalWS = cross(normalWS, tangentWS) * sign;
 }