diff -r 774c00348f9f -r cd16b6895f62 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Tue Oct 10 10:02:29 2023 +0200
+++ b/mercurial/localrepo.py	Tue Oct 10 10:02:37 2023 +0200
@@ -1089,10 +1089,9 @@
     if chunkcachesize is not None:
         data_config.chunk_cache_size = chunkcachesize
 
-    deltabothparents = ui.configbool(
+    delta_config.delta_both_parents = ui.configbool(
         b'storage', b'revlog.optimize-delta-parent-choice'
     )
-    options[b'deltabothparents'] = deltabothparents
     dps_cgds = ui.configint(
         b'storage',
         b'revlog.delta-parent-search.candidate-group-chunk-size',