TYPO3 Core

TYPO3 11.5.14, PHP 7.4

When I am setting the Sytem Maintainers in the AdditionalConfiguration.php without a trailing comma, i.e.

'systemMaintainers' => [
            1,17
        ],

The last administrator in the list (uid 17) cannot see the Admin tools in the backend. When I put the comma, i.e.

'systemMaintainers' => [
            1,17,
        ],

admin 17 can see the Admin tools.

In both cases how ever he is marked as system maintainer in his user record, see attached screenshot.

Might be related to https://forge.typo3.org/issues/97779