Ticket #56747: 56747.em.patch

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

@@ -30 +30 @@
         text-align: right;
 }
 
+[class^="wp-block-"]:not(.wp-block-gallery) figcaption em {
+        font-style: normal;
+}
+
 /*--------------------------------------------------------------
 2.0 Blocks - Common Blocks
 --------------------------------------------------------------*/

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

@@ -458 +458 @@
         margin-top: 0.5em;
 }
 
-/* Caption styles*/
+/* Caption styles */
 
-[class^="wp-block-"]:not(.wp-block-gallery) figcaption {
+[class^="wp-block-"]:not(.wp-block-gallery) figcaption,
+[class*=" wp-block-"]:not(.wp-block-gallery) figcaption {
         font-style: italic;
         margin-bottom: 1.5em;
         text-align: left;
 }
 
-.rtl [class^="wp-block-"]:not(.wp-block-gallery) figcaption {
+.rtl [class^="wp-block-"]:not(.wp-block-gallery) figcaption,
+.rtl [class*=" wp-block-"]:not(.wp-block-gallery) figcaption {
         text-align: right;
 }
 
+[class^="wp-block-"]:not(.wp-block-gallery) figcaption em,
+[class*=" wp-block-"]:not(.wp-block-gallery) figcaption em {
+        font-style: normal;
+}
+
 /* Code styles */
 
 .wp-block-freeform.block-library-rich-text__tinymce code {