WebGLRenderer: invalidate materials on async instanceColor set (#26430)

* WebGLRenderer: invalidate materials on async instanceColor set

* WebGLRenderer: cleanup

src/renderers/WebGLRenderer.js

@@ -1601,6 +1601,7 @@ class WebGLRenderer {
 
 			materialProperties.outputColorSpace = parameters.outputColorSpace;
 			materialProperties.instancing = parameters.instancing;
+			materialProperties.instancingColor = parameters.instancingColor;
 			materialProperties.skinning = parameters.skinning;
 			materialProperties.morphTargets = parameters.morphTargets;
 			materialProperties.morphNormals = parameters.morphNormals;
@@ -1695,6 +1696,14 @@ class WebGLRenderer {
 
 					needsProgramChange = true;
 
+				} else if ( object.isInstancedMesh && materialProperties.instancingColor === true && object.instanceColor === null ) {
+
+					needsProgramChange = true;
+
+				} else if ( object.isInstancedMesh && materialProperties.instancingColor === false && object.instanceColor !== null ) {
+
+					needsProgramChange = true;
+
 				} else if ( materialProperties.envMap !== envMap ) {
 
 					needsProgramChange = true;