Updated builds.

build/three.cjs

@@ -33167,7 +33167,7 @@ class InstancedMesh extends Mesh {
 
 		if ( this.instanceColor === null ) {
 
-			this.instanceColor = new InstancedBufferAttribute( new Float32Array( this.instanceMatrix.count * 3 ), 3 );
+			this.instanceColor = new InstancedBufferAttribute( new Float32Array( this.instanceMatrix.count * 3 ).fill( 1 ), 3 );
 
 		}
 

build/three.module.js

@@ -33165,7 +33165,7 @@ class InstancedMesh extends Mesh {
 
 		if ( this.instanceColor === null ) {
 
-			this.instanceColor = new InstancedBufferAttribute( new Float32Array( this.instanceMatrix.count * 3 ), 3 );
+			this.instanceColor = new InstancedBufferAttribute( new Float32Array( this.instanceMatrix.count * 3 ).fill( 1 ), 3 );
 
 		}