I have defined messages for the languages de and fallback language en.

When I execute console debug:translation de AppBundle I only retrieve the informations to de, but no comparison to the fallback en, as shown in the manual.

A bit digging showed it's the test if ($translator instanceof Translator) in function loadFallbackCatalogues in TranslationDebugCommand.php

A dump of $translator shows it's an instance of Symfony\Component\Translation\DataCollectorTranslator.

When I remove the test, I get the desired output, a comparison between used and fallback language.

I'm using Symfony 3.