diff -r 83ce99f5e7f2 -r d900f74456cc mercurial/revlog.py
--- a/mercurial/revlog.py	Tue Oct 10 10:03:01 2023 +0200
+++ b/mercurial/revlog.py	Tue Oct 10 10:03:09 2023 +0200
@@ -637,8 +637,6 @@
             comp_engine_opts[b'zlib.level'] = opts[b'zlib.level']
         if b'zstd.level' in opts:
             comp_engine_opts[b'zstd.level'] = opts[b'zstd.level']
-        if b'maxdeltachainspan' in opts:
-            self.delta_config.max_deltachain_span = opts[b'maxdeltachainspan']
         if self._mmaplargeindex and b'mmapindexthreshold' in opts:
             mmapindexthreshold = opts[b'mmapindexthreshold']
             self.data_config.mmap_index_threshold = mmapindexthreshold