I don't it is overly important that we spend time fixing up non critical bugs in Key/Value store as we are moving away from it anyway.
Patch available: http://gerrit.beaker-project.org/4497
This fix was merged into the release-21 branch but we won't be producing any further 21.x bug fix releases. This will be included with 22.0 instead.
Beaker 22.0 has been released.