diff -u b/core/includes/theme.inc b/core/includes/theme.inc
--- b/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1309,9 +1309,4 @@
   $language_interface = \Drupal::languageManager()->getCurrentLanguage();
 
-  // $site_config only needed on maintenance and install paths.
-  if (defined('MAINTENANCE_MODE')) {
-    $site_config = \Drupal::config('system.site');
-  }
-
   // Move some variables to the top level for themer convenience and template cleanliness.
   $variables['title'] = $variables['page']['#title'];
@@ -1327,11 +1322,4 @@
   $variables['language']          = $language_interface;
 
-  // Only generate branding variables on maintenance and install paths.
-  if (defined('MAINTENANCE_MODE')) {
-    $variables['logo'] = theme_get_setting('logo.url');
-    $variables['site_name'] = $site_config->get('name');
-    $variables['site_slogan'] = $site_config->get('slogan');
-  }
-
   // An exception might be thrown.
   try {
@@ -1444,6 +1432,13 @@
 
   // @see system_page_attachments()
   $variables['#attached']['library'][] = 'system/maintenance';
+
+  // Maintenance page and install page need branding info in variables because
+  // there is no blocks.
+  $site_config = \Drupal::config('system.site');
+  $variables['logo'] = theme_get_setting('logo.url');
+  $variables['site_name'] = $site_config->get('name');
+  $variables['site_slogan'] = $site_config->get('slogan');
 }
 
 /**
diff -u b/core/modules/color/color.module b/core/modules/color/color.module
--- b/core/modules/color/color.module
+++ b/core/modules/color/color.module
@@ -108,21 +108,6 @@
 }
 
 /**
- * Implements hook_preprocess_page().
- *
- * Replace the logo with the colored version if available.
- */
-function color_preprocess_page(&$variables) {
-  $theme_key = \Drupal::theme()->getActiveTheme()->getName();
-
-  // Override logo.
-  $logo = \Drupal::config('color.theme.' . $theme_key)->get('logo');
-  if ($logo && $variables['logo'] && preg_match('!' . $theme_key . '/logo.svg$!', $variables['logo'])) {
-    $variables['logo'] = file_create_url($logo);
-  }
-}
-
-/**
  * Implements hook_block_view_BASE_BLOCK_ID_alter().
  */
 function color_block_view_system_branding_block_alter(array &$build, BlockPluginInterface $block) {