diff -r 96cb63a86ee5 -r 6454c117c6a4 mercurial/cacheutil.py
--- a/mercurial/cacheutil.py	Thu Jun 13 09:52:39 2024 +0200
+++ b/mercurial/cacheutil.py	Mon Jun 24 12:05:31 2024 +0200
@@ -14,6 +14,8 @@
     # ones. Therefore copy all branch caches over.
     cachefiles = [b'branch2']
     cachefiles += [b'branch2-%s' % f for f in repoview.filtertable]
+    cachefiles += [b'branch3']
+    cachefiles += [b'branch3-%s' % f for f in repoview.filtertable]
     cachefiles += [b'rbc-names-v1', b'rbc-revs-v1']
     cachefiles += [b'tags2']
     cachefiles += [b'tags2-%s' % f for f in repoview.filtertable]