BUG React form schema renders second level CMS tabs immediately

[robbieaverill]

CWP 2.1.0-rc1 with silverstripe/recipe-content-blocks 2.0.x-dev, which includes silverstripe/versioned-admin 1.0.x-dev

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The New, Approved and Spam tabs are a second level tabset that should be rendered under the Comments tabs, like this:

They are being rendered at the bottom of the Root.Main.Content tab though.