Confluence Cloud Version: 1000.0.0-a00d4ebd227a
After creating my custom tabs in the Navitabs wizard, the preview and publish view of the tabs on my Confluence page shows the "[object Object], [object Object], [object Object]" strings.
This only happens when the contents of the tabs are code blocks with sample code. I have not seen this issue when not using code blocks in the tab content.
I've noticed that removing the type of language for the code block will then render it, but a bit buggy and without syntax highlighting or line numbers:
