diff --git a/packages/ep_theme/Configuration/RTE/Default.yaml b/packages/ep_theme/Configuration/RTE/Default.yaml
index 5f2866c..2edaf12 100644
--- a/packages/ep_theme/Configuration/RTE/Default.yaml
+++ b/packages/ep_theme/Configuration/RTE/Default.yaml
@@ -1,5 +1,6 @@
 imports:
   - { resource: "EXT:rte_ckeditor/Configuration/RTE/Processing.yaml" }
+  - { resource: "EXT:ep_theme/Configuration/RTE/Processing.yaml" }
   - { resource: "EXT:rte_ckeditor/Configuration/RTE/Editor/Base.yaml" }
   - { resource: "EXT:rte_ckeditor/Configuration/RTE/Editor/Plugins.yaml" }
 
diff --git a/packages/ep_theme/Configuration/RTE/Minimal.yaml b/packages/ep_theme/Configuration/RTE/Minimal.yaml
index 27a1054..0a47d6b 100644
--- a/packages/ep_theme/Configuration/RTE/Minimal.yaml
+++ b/packages/ep_theme/Configuration/RTE/Minimal.yaml
@@ -1,5 +1,6 @@
 imports:
   - { resource: "EXT:rte_ckeditor/Configuration/RTE/Processing.yaml" }
+  - { resource: "EXT:ep_theme/Configuration/RTE/Processing.yaml" }
   - { resource: "EXT:rte_ckeditor/Configuration/RTE/Editor/Base.yaml" }
   - { resource: "EXT:rte_ckeditor/Configuration/RTE/Editor/Plugins.yaml" }
 
diff --git a/packages/ep_theme/Configuration/RTE/Processing.yaml b/packages/ep_theme/Configuration/RTE/Processing.yaml
new file mode 100644
index 0000000..3de8e96
--- /dev/null
+++ b/packages/ep_theme/Configuration/RTE/Processing.yaml
@@ -0,0 +1,10 @@
+# CKEditor 5 writes a data-list-item-id attribute to every list item it saves; it is only used inside the
+# editor. Removed on the way into the database, everything else passes unchanged.
+processing:
+  exitHTMLparser_db:
+    keepNonMatchedTags: 1
+    tags:
+      li:
+        fixAttrib:
+          data-list-item-id:
+            unset: 1