Material: Fix copy method to include allowOverride property (#32269)

Co-authored-by: Michael Herzog <michael.herzog@human-interactive.org>

src/materials/Material.js

@@ -832,6 +832,7 @@ class Material extends EventDispatcher {
 		if ( this.alphaToCoverage === true ) data.alphaToCoverage = true;
 		if ( this.premultipliedAlpha === true ) data.premultipliedAlpha = true;
 		if ( this.forceSinglePass === true ) data.forceSinglePass = true;
+		if ( this.allowOverride === false ) data.allowOverride = false;
 
 		if ( this.wireframe === true ) data.wireframe = true;
 		if ( this.wireframeLinewidth > 1 ) data.wireframeLinewidth = this.wireframeLinewidth;
@@ -967,6 +968,7 @@ class Material extends EventDispatcher {
 		this.alphaToCoverage = source.alphaToCoverage;
 		this.premultipliedAlpha = source.premultipliedAlpha;
 		this.forceSinglePass = source.forceSinglePass;
+		this.allowOverride = source.allowOverride;
 
 		this.visible = source.visible;