diff -r 127656e0b97b -r f636103c4d67 mercurial/debugcommands.py
--- a/mercurial/debugcommands.py	Tue Oct 10 18:02:20 2023 +0200
+++ b/mercurial/debugcommands.py	Tue Oct 10 10:56:42 2023 +0200
@@ -805,7 +805,7 @@
     index = r.index
     start = r.start
     length = r.length
-    generaldelta = r._generaldelta
+    generaldelta = r.delta_config.general_delta
     withsparseread = getattr(r, '_withsparseread', False)
 
     # security to avoid crash on corrupted revlogs