Index: src/wp-content/themes/twentyseventeen/style.css
===================================================================
--- src/wp-content/themes/twentyseventeen/style.css	(revision 38961)
+++ src/wp-content/themes/twentyseventeen/style.css	(working copy)
@@ -1076,6 +1076,10 @@
 	position: relative;
 }
 
+ol ul li {
+	display: list-item;
+}
+
 ol li:before {
 	content: counter(item) ".";
 	counter-increment: item;
@@ -1084,6 +1088,10 @@
 	position: absolute;
 }
 
+ol ul li:before {
+	content: '';
+}
+
 li > ul,
 li > ol {
 	margin-bottom: 0;