handle synchronous loading correctly

src/ol/reproj/Tile.js

@@ -334,15 +334,15 @@ class ReprojTile extends Tile {
         }.bind(this)
       );
 
+      if (leftToLoad === 0) {
+        setTimeout(this.reproject_.bind(this), 0);
+      } else {
         this.sourceTiles_.forEach(function (tile, i, arr) {
           const state = tile.getState();
           if (state == TileState.IDLE) {
             tile.load();
           }
         });
-
-      if (leftToLoad === 0) {
-        setTimeout(this.reproject_.bind(this), 0);
       }
     }
   }