--- a/mercurial/changelog.py	Tue Oct 10 10:01:57 2023 +0200
+++ b/mercurial/changelog.py	Tue Oct 10 10:02:05 2023 +0200
@@ -416,7 +416,7 @@
             # changelogs don't benefit from generaldelta.
 
             self._format_flags &= ~revlog.FLAG_GENERALDELTA
-            self._generaldelta = False
+            self.delta_config.general_delta = False
 
         # Delta chains for changelogs tend to be very small because entries
         # tend to be small and don't delta well with each. So disable delta