Ticket #46785: 46785.patch

src/wp-content/themes/twentyseventeen/assets/css/blocks.css

@@ -53 +53 @@
 }
 
 .wp-block-image figure.alignleft {
+        margin-top: 0;
         margin-right: 1.5em;
 }
 
 .wp-block-image figure.alignright {
+        margin-top: 0;
         margin-left: 1.5em;
 }
 
+.entry-content > .wp-block-image:first-child figure.alignleft,
+.entry-content > .wp-block-image:first-child figure.alignright {
+        margin-top: 1.5em;
+}
+
 /* Gallery */
 
 .wp-block-gallery {