I am trying to create a new pages using the preload parameter. My expected behavior is an editing window appears with the content from Template:Example already inside the editing box. This example assumes Template:Example is already created and contains content and that the article Test does not already exist.
index.php?title=Test&action=edit&preload=Template:Example
The link works fine in Vector and I get my expected behavior.
The link works fine in MinervaNeue if JavaScript has been disabled.
The link fails in MinervaNeue if JavaScript is enabled. The initial page loads fine before a JavaScript function changes the page's display to a full screen editor without any preloaded content.