"Setup on child pages" does not work

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For some reason the "Setup on child pages" in "Page Types" => "Output" => "Edit Mode" does not work, it redirects the whole page to an unstyled form and when you click save it redirects to another page saying 1 out of 4 but then does nothing. I have to click back button to then find that it hasn't added the block to the child pages of that page type. Anyone know what may be causing this?

 
chillax86 replied on at Permalink Best Answer Reply
This was due to adding a custom bootstrap.min.js to the theme without setting

$this->providesAsset('javascript', 'bootstrap/*');