mercurial/changelog.py

--- a/mercurial/changelog.py	Mon May 17 15:05:24 2021 +0200
+++ b/mercurial/changelog.py	Mon May 03 12:34:11 2021 +0200
@@ -445,6 +445,8 @@
 
     def delayupdate(self, tr):
         """delay visibility of index updates to other readers"""
+        if self._docket is not None:
+            return
 
         if not self._delayed:
             if len(self) == 0: