Hey there!
I added the widget “Edit Single Product Tabs” to my “Single Product” page. To show the Tabs, i chose the type “accordion”. When I click on the accordion in edit-mode it opens and closes several times per click. And in preview-mode it only shows one of two tabs (the tab not shown is not empty). Maybe I am doing something wrong, maybe its a bug? Please see the video in the attachment and the credentials for an employee account to my WP site in the private content area.