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enwiki:Dice and simplewiki:Dice belong to the same item 96406

If you send a request to wbgetitems requesting both pages at the same time using 
http://wikidata-test-repo.wikimedia.de/w/api.php?action=wbgetitems&sites=enwiki|simplewiki&titles=Dice&language=en and error is returned:

<api>
  <error code="internal_api_error_MWException" info="Exception Caught: Internal error in ApiResult::setElement: Attempting to add element id=96406, existing value is 96406" xml:space="preserve">

#0 /var/www/wikidata-test-repo.wikimedia.de/w/includes/api/ApiBase.php(1405): wfDebugDieBacktrace('Internal error ...')
#1 /var/www/wikidata-test-repo.wikimedia.de/w/includes/api/ApiResult.php(157): ApiBase::dieDebug('ApiResult::setE...', 'Attempting to a...')
#2 /var/www/wikidata-test-repo.wikimedia.de/w/includes/api/ApiResult.php(290): ApiResult::setElement(Array, 'id', 96406, false)
#3 /var/www/wikidata-test-repo.wikimedia.de/w/extensions/Wikibase/repo/includes/api/ApiGetItems.php(100): ApiResult->addValue(Array, 'id', 96406)
#4 /var/www/wikidata-test-repo.wikimedia.de/w/includes/api/ApiMain.php(714): Wikibase\ApiGetItems->execute()
#5 /var/www/wikidata-test-repo.wikimedia.de/w/includes/api/ApiMain.php(363): ApiMain->executeAction()
#6 /var/www/wikidata-test-repo.wikimedia.de/w/includes/api/ApiMain.php(347): ApiMain->executeActionWithErrorHandling()
#7 /var/www/wikidata-test-repo.wikimedia.de/w/api.php(113): ApiMain->execute()
#8 {main}

</error>
</api>