Lots of errors about this in the logs, for about a week now.
I see them with type "differential:action" and "differential:update" as well.
trace:
```
[2014-10-13 18:05:08] EXCEPTION: (PhutilProxyException) Error while executing task ID 999747 from queue. {>} (Exception) Transaction ("PHID-XACT-DREV-tfrc7uzfynsokmy", of type "differential:inline") requires a handle ("PHID-DREV-soevgyemnnxqd3njxqrw") that it did not load. at [<phabricator>/src/applications/transactions/storage/PhabricatorApplicationTransaction.php:276]
#0 PhabricatorApplicationTransaction::getHandle(string) called at [<phabricator>/src/applications/transactions/storage/PhabricatorApplicationTransaction.php:304]
#1 PhabricatorApplicationTransaction::renderHandleLink(string) called at [<phabricator>/src/applications/differential/storage/DifferentialTransaction.php:317]
#2 DifferentialTransaction::getTitleForFeed(PhabricatorApplicationTransactionFeedStory) called at [<phabricator>/src/applications/transactions/storage/PhabricatorApplicationTransaction.php:1106]
#3 PhabricatorApplicationTransaction::renderAsTextForDoorkeeper(DifferentialDoorkeeperRevisionFeedStoryPublisher, PhabricatorApplicationTransactionFeedStory, array) called at [<phabricator>/src/applications/differential/storage/DifferentialTransaction.php:604]
#4 DifferentialTransaction::renderAsTextForDoorkeeper(DifferentialDoorkeeperRevisionFeedStoryPublisher, PhabricatorApplicationTransactionFeedStory, array) called at [<phabricator>/src/applications/transactions/feed/PhabricatorApplicationTransactionFeedStory.php:117]
#5 PhabricatorApplicationTransactionFeedStory::renderAsTextForDoorkeeper(DifferentialDoorkeeperRevisionFeedStoryPublisher) called at [<phabricator>/src/applications/doorkeeper/engine/DoorkeeperFeedStoryPublisher.php:86]
#6 DoorkeeperFeedStoryPublisher::getStoryText(DifferentialRevision) called at [<phabricator>/src/applications/doorkeeper/worker/DoorkeeperFeedWorkerJIRA.php:168]
#7 DoorkeeperFeedWorkerJIRA::renderStoryText() called at [<phabricator>/src/applications/doorkeeper/worker/DoorkeeperFeedWorkerJIRA.php:57]
#8 DoorkeeperFeedWorkerJIRA::publishFeedStory() called at [<phabricator>/src/applications/doorkeeper/worker/DoorkeeperFeedWorker.php:173]
#9 DoorkeeperFeedWorker::doWork() called at [<phabricator>/src/infrastructure/daemon/workers/PhabricatorWorker.php:87]
#10 PhabricatorWorker::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/storage/PhabricatorWorkerActiveTask.php:156]
#11 PhabricatorWorkerActiveTask::executeTask() called at [<phabricator>/src/infrastructure/daemon/workers/PhabricatorTaskmasterDaemon.php:19]
#12 PhabricatorTaskmasterDaemon::run() called at [<phutil>/src/daemon/PhutilDaemon.php:91]
#13 PhutilDaemon::execute() called at [<phutil>/scripts/daemon/exec/exec_daemon.php:111]
```