Let's try removing this odd code...
// Prime the module list and corresponding Extension objects.
// @todo Remove System module. Needed because
// \Drupal\Core\Datetime\DateFormatter has a (needless) dependency on the
// 'date_format' entity, so calls to DateFormatter::format() and
// DateFormatter::formatInterval() cause a plugin not found exception.
$this->moduleList = [
'system' => 0,
];
$this->moduleData = [
'system' => new Extension($this->root, 'module', 'core/modules/system/system.info.yml', 'system.module'),
];
Active
11.0 🔥
base system
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