Improve image drag rule

packages/block-editor/src/components/block-draggable/content.scss

@@ -18,6 +18,8 @@
 	}
 }
 
-img:not([draggable]) {
+// Images are draggable by default, so disable drag for them if not explicitly
+// set. This is done so that the block can capture the drag event instead.
+.wp-block img:not([draggable]) {
 	pointer-events: none;
 }