Ticket #46290: 46290.diff

wp-admin/edit-form-blocks.php

@@ -306 +306 @@
         $editor_settings['colors'] = $color_palette;
 }
 
-if ( ! empty( $font_sizes ) ) {
+if ( false !== $font_sizes ) {
         $editor_settings['fontSizes'] = $font_sizes;
 }