fixes #10521: Only remove bottom-border from last row of cells in tbody and tfoot within responsive tables

less/tables.less

@@ -227,6 +227,13 @@ table {
             border-right: 0;
           }
         }
+      }
+
+      // Only nuke the last row's bottom-border in `tbody` and `tfoot` since
+      // chances are there will be only one `tr` in a `thead` and that would
+      // remove the border altogether.
+      > tbody,
+      > tfoot {
         > tr:last-child {
           > th,
           > td {
@@ -234,6 +241,7 @@ table {
           }
         }
       }
+
     }
   }
 }