Post-Customizer
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Debug Bar Console conflict
If the Debug Bar Console plugin is enabled in current WordPress trunk, a Uncaught TypeError: Cannot read property 'body' of undefined appears when previewing a post with Post Customizer, killing the remaining Javascript and killing desired functionality.
This is likely not a Post Customizer issue, but it may be worth seeing if a workaround is available. Debug Bar Console does not throw the same error in the theme customizer, so it seems related to the repurposing of the interface.
Definitely seems like a bug with Debug Bar Console to me. All that JS should not be firing when the admin bar is not rendering in the DOM. What do you think?