TYPO3 Core

Hi, I confirm the issue with TYPO3 10.4.27

Issue is still in 10.4.30

Found a culprit :

in typo3/sysext/install/Classes/Command/LanguagePackCommand.php, function "execute" calls lateBootService->loadExtLocalconfDatabaseAndExtTables(...)

And function "loadExtLocalconfDatabaseAndExtTables" calls Bootstrap::unsetReservedGlobalVariables() that nullifies $GLOBALS['BE_USER'])

I can also confirm this issue on TYPO3 10.4.30.

The error appears only if I start the task manually in the scheduler module. There's no error if the task runs automatically.
In both cases the translation files are downloaded, so this isn't a big issue (at least for me).

I confirm that it works in v11.