Hi,
My composer.json have "johnpbloch/wordpress-core-installer": "^2.0" but also a yoast "yoast/wordpress-seo": "^12.5" installer
So as installation of wordpress take time, yoast create a wp-content folder before wordpress-core-installer finished. So a wp-content folder already exists whan the wordpress install wants to create one.
I think johnpbloch install don't make the right choice when a folder already exists because it ended with wp-content/wp-content/theme
If I remove the plugins, installatyion is correct and I get wp-content/theme
Thank you
Florent