diff --git a/core/modules/filter/src/FilterBag.php b/core/modules/filter/src/FilterBag.php
index 1837a0c..f509847 100644
--- a/core/modules/filter/src/FilterBag.php
+++ b/core/modules/filter/src/FilterBag.php
@@ -112,7 +112,12 @@ public function sortHelper($aID, $bID) {
    */
   public function getConfiguration() {
     $configuration = parent::getConfiguration();
-    // Remove configuration if it matches the defaults.
+    // Remove configuration if it matches the defaults. In self::getAll(), we
+    // load all available filters, in addition to the enabled filters stored in
+    // configuration. In order to prevent those from bleeding through to the
+    // stored configuration, remove all filters that match the default values.
+    // Because filters are disabled by default, this will never remove the
+    // configuration of an enabled filter.
     foreach ($configuration as $instance_id => $instance_config) {
       $default_config = array();
       $default_config['id'] = $instance_id;