--- a/servo/ports/geckolib/glue.rs
+++ b/servo/ports/geckolib/glue.rs
@@ -278,17 +278,18 @@ pub extern "C" fn Servo_TraverseSubtree(
     if needs_animation_only_restyle {
         traverse_subtree(element,
                          raw_data,
                          traversal_flags | ANIMATION_ONLY,
                          unsafe { &*snapshots });
     }
 
     if restyle_behavior == Restyle::ForThrottledAnimationFlush {
-        return needs_animation_only_restyle;
+        return element.has_animation_only_dirty_descendants() ||
+               element.borrow_data().unwrap().restyle.is_restyle();
     }
 
     traverse_subtree(element,
                      raw_data,
                      traversal_flags,
                      unsafe { &*snapshots });
 
     if restyle_behavior == Restyle::ForNewlyBoundElement {