I have a problem with setting up a CP navigation for my module.

In module's init() I declared the following:

    function (RegisterCpNavItemsEvent $event) {
        $event->navItems[] = [
            'url' => 'asset-checker-module/broken-links',
            'label' => 'Checker',
            'subnav' => [
                'broken-links' => [
                    'url' => 'asset-checker-module/broken-links',
                    'label' => 'Fehlerhafte Links'
                'unused-assets' => [
                    'url' => 'asset-checker-module/unused-assets',
                    'label' => 'Nicht verwendete Dateien'

So I see my main navigation item, when I click on it, the subnavigation gets expanded, the first element is active. But when I click on the second item, parent item gets collapsed.

I tried to fix it by setting selectedSubnavItem in my template, it did not help.

Any ideas?

Running Craft 3.2.7.

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