Index: src/wp-content/themes/twentynineteen/single.php
===================================================================
--- src/wp-content/themes/twentynineteen/single.php	(revision 58825)
+++ src/wp-content/themes/twentynineteen/single.php	(working copy)
@@ -27,8 +27,7 @@
 					// Parent post navigation.
 					the_post_navigation(
 						array(
-							/* translators: %s: Parent post link. */
-							'prev_text' => sprintf( __( '<span class="meta-nav">Published in</span><span class="post-title">%s</span>', 'twentynineteen' ), '%title' ),
+							'prev_text' => _x( '<span class="meta-nav">Published in</span><br><span class="post-title">%title</span>', 'Parent post link', 'twentynineteen' ),
 						)
 					);
 				} elseif ( is_singular( 'post' ) ) {