--- a/devtools/server/actors/highlighters/shapes.js
+++ b/devtools/server/actors/highlighters/shapes.js
@@ -521,17 +521,17 @@ class ShapesHighlighter extends AutoRefr
 
         // Calculate constraints for a virtual viewport which ensures that a dragged
         // marker remains visible even at the edges of the actual viewport.
         this.setViewport(BASE_MARKER_SIZE);
         break;
       case "mouseup":
         if (this[_dragging]) {
           this[_dragging] = null;
-          this._handleMarkerHover(null);
+          this._handleMarkerHover(this.hoveredPoint);
         }
         break;
       case "mousemove":
         if (!this[_dragging]) {
           this._handleMouseMoveNotDragging(pageX, pageY);
           return;
         }
         event.stopPropagation();