diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 80933d2508..f58978ea95 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -140,6 +140,7 @@ Changelog
 * Fix: Correctly place comment buttons next to date / datetime / time fields. (Srishti Jaiswal)
 * Fix: Reduce confusing spacing below StreamField blocks help text (Rishabh Sharma)
 * Fix: Make sure alt text quality check is on by default as documented (Thibaud Colas)
+* Fix: Prevent `StreamChildrenToListBlockOperation` from duplicating data across multiple StreamField instances (Joshua Munn)
 * Docs: Update example for customizing "p-as-heading" accessibility check without overriding built-in checks (Cynthia Kiser)
 * Docs: Update accessibility considerations on alt text in light of contextual alt text improvements (Cynthia Kiser)
 
diff --git a/docs/releases/6.3.3.md b/docs/releases/6.3.3.md
index 790c66268d..cff7c8134a 100644
--- a/docs/releases/6.3.3.md
+++ b/docs/releases/6.3.3.md
@@ -17,6 +17,7 @@ depth: 1
  * Correctly place comment buttons next to date / datetime / time fields. (Srishti Jaiswal)
  * Reduce confusing spacing below StreamField blocks help text (Rishabh Sharma)
  * Make sure alt text quality check is on by default as documented (Thibaud Colas)
+ * Prevent `StreamChildrenToListBlockOperation` from duplicating data across multiple StreamField instances (Joshua Munn)
 
 ### Documentation