Engine.createRenderTargetTexture now set the _baseWidth/Height

src/babylon.engine.ts

@@ -1832,6 +1832,8 @@
             if (generateDepthBuffer) {
                 texture._depthBuffer = depthBuffer;
             }
+            texture._baseWidth = width;
+            texture._baseHeight = height;
             texture._width = width;
             texture._height = height;
             texture.isReady = true;
@@ -2450,4 +2452,4 @@
             }
         }
     }
-}
+}