diff -r a41565bef69f -r e8c11a2c96c0 mercurial/utils/storageutil.py
--- a/mercurial/utils/storageutil.py	Thu Feb 18 17:36:52 2021 +0100
+++ b/mercurial/utils/storageutil.py	Thu Feb 18 18:18:35 2021 +0100
@@ -478,6 +478,7 @@
             baserevisionsize=baserevisionsize,
             revision=revision,
             delta=delta,
+            sidedata=sidedata,
         )
 
         prevrev = rev