I can’t upload .json file after updating WordPress

I can’t upload a .json file to my media library anymore after updating WordPress. It was working fine before

I haven’t added any new plugins/themes/etc

Here’s the code in my functions.php file:

add_filter('upload_mimes', 'enable_extended_upload');
 
function enable_extended_upload ( $mime_types =array() ) {
 
// The MIME types listed here will be allowed in the media library.
// You can add as many MIME types as you want.
$mime_types['zip'] = 'application/zip';
$mime_types['json'] = 'application/json';
 
return $mime_types;
}