modules/javafx.controls/src/main/java/javafx/scene/control/skin/MenuBarSkin.java

*** 1061,1073 ****
          }
          setFocusedMenuIndex(-1);
      }
  
      private void moveToMenu(Direction dir, boolean doShow) {
          findSibling(dir, focusedMenuIndex).ifPresent(p -> {
              setFocusedMenuIndex(p.getValue());
!             if (doShow) {
                  showMenu(p.getKey(), true);
              }
          });
      }
  
--- 1061,1074 ----
          }
          setFocusedMenuIndex(-1);
      }
  
      private void moveToMenu(Direction dir, boolean doShow) {
+         boolean showNextMenu = doShow && focusedMenu.isShowing();
          findSibling(dir, focusedMenuIndex).ifPresent(p -> {
              setFocusedMenuIndex(p.getValue());
!             if (showNextMenu) {
                  showMenu(p.getKey(), true);
              }
          });
      }