diff --git a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
index bec62ed..bceb596 100644
--- a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
+++ b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
@@ -181,43 +181,9 @@ public function validate(array $form, FormStateInterface $form_state) {
         // Remove the image style mappings since the breakpoint ID has changed.
         $form_state->unsetValue('keyed_styles');
       }
-      else {
-        $styles = $form_state->getValue('keyed_styles');
-        foreach ($styles as $breakpoint_id => $multiplier_styles) {
-          foreach ($multiplier_styles as $multiplier => $style) {
-            if ($style['image_mapping_type'] == 'sizes') {
-              $form_state->setValue(
-                array(
-                  'keyed_styles',
-                  $breakpoint_id,
-                  $multiplier,
-                  'image_mapping',
-                ),
-                array(
-                  'sizes_image_styles' => array_filter($style['sizes_image_styles']),
-                  'sizes' => $style['sizes'],
-                )
-              );
-            }
-            elseif ($style['image_mapping_type'] != 'image_style') {
-              $form_state->unsetValue(
-                array('keyed_styles', $breakpoint_id, $multiplier)
-              );
-            }
-            $form_state->unsetValue(
-              array(
-                'keyed_styles',
-                $breakpoint_id,
-                $multiplier,
-                'sizes_image_styles',
-              )
-            );
-            $form_state->unsetValue(
-              array('keyed_styles', $breakpoint_id, $multiplier, 'sizes')
-            );
-          }
-        }
-      }
+      // @todo Filter 'sizes_image_styles' to a normal array in
+      // https://www.drupal.org/node/2334387. For an example see
+      // \Drupal\Core\Block\BlockBase::validateConfigurationForm().
     }
   }