Is it a bug? blog-View read more button reference to home page
The problem here is 2 issues:


You're missing a field on your view to reference. In order to reference the Node ID in your view you'll need to add the field Content: ID so that it can be referenced in replacement patterns. It will also need to be ordered before your body field so that its value can referenced. You can use the Exclude from display option if you do not want it appearing in your view.
The format for token replacement has changed with D8. It's now Twig-like: {{ field_name }}. By default the Content: ID field should use the field name nid so your More link path value should be /node/{{ nid }}.