diff -r 6f94dc3cf8cf -r 13815c9decd4 mercurial/changelog.py
--- a/mercurial/changelog.py	Mon Jul 29 15:03:52 2024 +0200
+++ b/mercurial/changelog.py	Wed Jun 19 17:03:13 2024 +0200
@@ -324,6 +324,7 @@
 
             self._format_flags &= ~revlog.FLAG_GENERALDELTA
             self.delta_config.general_delta = False
+            self.data_config.generaldelta = 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