Uncommitted changes cannot be unshelved

Best summarised with an example:

jtait@sixtymilesmile:~/tmp/bzr-test$ bzr init .
Created a standalone tree (format: 2a)
jtait@sixtymilesmile:~/tmp/bzr-test$ bzr mkdir foo
added foo
jtait@sixtymilesmile:~/tmp/bzr-test$ bzr shelve --all
Selected changes:
-D foo/
Changes shelved with id "1".
jtait@sixtymilesmile:~/tmp/bzr-test$ bzr unshelve
Using changes with id "1".
bzr: ERROR: No final name for trans_id 'new-1'
file-id: 'tree_root-20120515235807-ymwemsv340h0l0uk-1'
root trans-id: None

jtait@sixtymilesmile:~/tmp/bzr-test$

The same problem apparently exists with the pipeline plugin:

jtait@sixtymilesmile:~/tmp/bzr-test$ bzr init .
Created a standalone tree (format: 2a)
jtait@sixtymilesmile:~/tmp/bzr-test$ bzr reconfigure
reconfigure reconfigure-pipeline
jtait@sixtymilesmile:~/tmp/bzr-test$ bzr reconfigure-pipeline
jtait@sixtymilesmile:~/tmp/bzr-test$ bzr pipes
* bzr-test
jtait@sixtymilesmile:~/tmp/bzr-test$ bzr mkdir bar
added bar
jtait@sixtymilesmile:~/tmp/bzr-test$ bzr add-pipe bzr-test-next
Tree is up to date at revision 0.
Created and switched to pipe "bzr-test-next".
jtait@sixtymilesmile:~/tmp/bzr-test$ bzr switch-pipe :prev
Uncommitted changes stored in pipe "bzr-test-next".
Switched from "bzr-test-next" to "bzr-test".
jtait@sixtymilesmile:~/tmp/bzr-test$ bzr switch-pipe :next
bzr: ERROR: No final name for trans_id 'new-1'
file-id: 'tree_root-20120516003515-9jw8bzbdirc6ibac-1'
root trans-id: None

jtait@sixtymilesmile:~/tmp/bzr-test$

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: bzr 2.5.0-2ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
CheckboxSubmission: dd3689fa6394f60ec14dbe98d0bab891
CheckboxSystem: b633b4f40868d491c2ae5b50030ce6f3
Date: Wed May 16 01:29:35 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
PackageArchitecture: all
SourcePackage: bzr
UpgradeStatus: Upgraded to precise on 2011-12-12 (155 days ago)