Home layout - alternative version issues

I want to create an alternative version of the home page, which uses the home layout. The home page lists the available posts. I copied the home layout exactly into home-alt.html and created a new markup file. The posts are listed but the formatting is lost - the preview image is about 1rem by 1rem and a lot of the styling is missing. If I point the md file to home.html it works fine, but when I change it to home-posts, even though it is exactly the same - it does not work.

Anyone know what I need to change?

is the new one home-alt or home-posts? maybe your names aren’t right?

is there a link to a repo?

Sorry got busy at work. I make a repo available and ping back. Thanks.