Bug with the first row in a menu

There seems to be a bug where the first row won't be activated when opening a menu a second time if it was the row that was open before closing the menu.

I tested using the example in the repository and it also contains the bug, so I know it's not my own code causing it.

Steps to reproduce using the example.

1. Click the menu and hover over the first item 'Patas'.
2. Move off to the left and click to close the menu.
3. Click the menu again and hover to the first item, it won't activate this time.

If you hover over any item other than the first one before closing the menu the bug doesn't occur.