Clearing disposes()

src/Materials/Textures/babylon.renderTargetTexture.ts

@@ -560,6 +560,8 @@
 
             this.clearPostProcesses(true);
 
+            this.renderList = null;
+
             // Remove from custom render targets
             var scene = this.getScene();
             var index = scene.customRenderTargets.indexOf(this);

src/babylon.scene.ts

@@ -3260,6 +3260,8 @@
 
             this.importedMeshesFiles = new Array<string>();
 
+            this.resetCachedMaterial();
+
             if (this._depthRenderer) {
                 this._depthRenderer.dispose();
             }