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If Excerpt of Post is enabled and you use the Send as Newsletter feature in the blog post editor, the plugin will add second Read more link below the featured image. The href attribute of this link is then empty.
The first Read more link works.
The bug must have been added after version 4.6. The bug seems to be in wp-mailinglist-plugin.php. If we use the version 4.6.19 of this file with the version 4.8.6 of the plugin, the Read more bug disappears.