diff -r 090fc6a95e50 -r a5701ffc10e4 mercurial/sparse.py
--- a/mercurial/sparse.py	Thu Jul 08 18:51:45 2021 +0200
+++ b/mercurial/sparse.py	Thu Jul 08 18:59:55 2021 +0200
@@ -646,7 +646,7 @@
     The updated sparse config is written out and the working directory
     is refreshed, as needed.
     """
-    with repo.wlock():
+    with repo.wlock(), repo.dirstate.parentchange():
         # read current configuration
         raw = repo.vfs.tryread(b'sparse')
         includes, excludes, profiles = parseconfig(repo.ui, raw, b'sparse')