Only trigger change event if animating a tile transition

src/ol/source/Raster.js

@@ -862,8 +862,10 @@ class RasterSource extends ImageSource {
     this.dispatchEvent(
       new RasterSourceEvent(RasterEventType.AFTEROPERATIONS, frameState, data)
     );
+    if (frameState.animate) {
       requestAnimationFrame(this.changed.bind(this));
     }
+  }
 
   disposeInternal() {
     if (this.processor_) {