diff -r 9d1c56a79bb8 -r 116da6bb7e3b mercurial/bundle2.py
--- a/mercurial/bundle2.py	Mon Feb 21 14:44:22 2022 +0100
+++ b/mercurial/bundle2.py	Tue May 23 01:28:56 2023 +0200
@@ -1952,7 +1952,7 @@
         )
         requirements = streamclone.streamed_requirements(repo)
         requirements = _formatrequirementsspec(requirements)
-        part = bundler.newpart(b'stream3', data=it)
+        part = bundler.newpart(b'stream3-exp', data=it)
         part.addparam(b'bytecount', b'%d' % bytecount, mandatory=True)
         part.addparam(b'filecount', b'%d' % filecount, mandatory=True)
         part.addparam(b'requirements', requirements, mandatory=True)
@@ -2611,7 +2611,7 @@
     streamclone.applybundlev2(repo, part, filecount, bytecount, requirements)
 
 
-@parthandler(b'stream3', (b'requirements', b'filecount', b'bytecount'))
+@parthandler(b'stream3-exp', (b'requirements', b'filecount', b'bytecount'))
 def handlestreamv3bundle(op, part):
     return handlestreamv2bundle(op, part)