Removing tabset using "Remove" button in visual editor leaves invisible tab contents

[Random121]

Using the visual editor, when removing the tabset using the remove button, it leaves behind the tab contents as invisible text..

Version: latest commit (bff05fd) on scarlett branch

Steps to reproduce

1. Create a page in the visual editor
2. Insert a tabset
3. Click on the "Remove" button for the tabset
4. Click the "Create page" button
5. See that it creates the page with text "Content of the first tab. Content of the second tab." (which is the default content for a tabset)
6. Re-open page in visual editor
7. See that the tab contents is invisible in the visual editor
8. Check in page source that the text is actually still there

What I expect: tab content should be removed together with the tabset, or at least some other indication that the tab content is left in the document

Example of what is seen in the visual editor afterwards

[NGPixel]

Fixed via 812884d. Will land in next release.