Sharepoint List Form Formatting - JSON gone after refresh (RESOLVED)

Hello,

I was having a problem with List Form formatting when configuring the layout with JSON for the Header, Body and Footer.

The JSON initially saved however when I refreshed the page the JSON was gone again.

After some fiddling I discovered this was being caused by my content type being "Read Only".

So effectively, I switched this to "No" and then my JSON formatting issue was resolved.

Hope this post helps others out! 🙂