add changelog for #9108

- relates to #7712

CHANGELOG.txt

@@ -14,6 +14,7 @@ Changelog
  * Provide a more accessible page title where the unique information is shown first and the CMS name is shown last (Mehrdad Moradizadeh)
  * Pull out behaviour from `AbstractFormField` to `FormMixin` and `AbstractEmailForm` to `EmailFormMixin` to allow use with subclasses of `Page` (Mehrdad Moradizadeh, Kurt Wall)
  * Fix: Prevent `PageQuerySet.not_public` from returning all pages when no page restrictions exist (Mehrdad Moradizadeh)
+ * Fix: Ensure that duplicate block ids are unique when duplicating stream blocks in the page editor (Joshua Munn)
 
 
 4.0.1 (05.09.2022)

docs/releases/4.1.md

@@ -26,6 +26,7 @@ Wagtail 4.1 is designated a Long Term Support (LTS) release. Long Term Support r
 ### Bug fixes
 
  * Prevent `PageQuerySet.not_public` from returning all pages when no page restrictions exist (Mehrdad Moradizadeh)
+ * Ensure that duplicate block ids are unique when duplicating stream blocks in the page editor (Joshua Munn)
 
 ## Upgrade considerations