Laravel #can method does not work for all roles - laravel

Question

Problem
The user with the role "author" doesnt see the HTML inside the #can ... endcan block.
Description
Developing a Laravel package and restrict the navbar accordingly to the roles. But when i try to make a nav element only for a user with the role "author", it doesnt work. When i replace "author" with another role, it works.
Maybe my approach is too complicated and proposals for other approaches are welcome as well as hints, where i have to look for solving the problem.
I have a "standard" setup with three tables. One for users, one for roles and one for role_user relations (as it is described here). The relations in the models are set.
You can find the whole project here.
Thanks in advance.
Code
#can('author')
<li class="nav-item">
<a class="nav-link"
href="{{ route('pages.index') }}">{{ __('limplecms::navigation.pages.overview')}}</a>
</li>
#endcan
#canany(['admin', 'editor'])
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" role="button" data-toggle="dropdown"
aria-expanded="false">
{{ __('limplecms::navigation.pages')}}
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="{{ route('pages.index') }}">
{{__('limplecms::navigation.pages.overview')}}
</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="{{ route('pages.create') }}">
{{__('limplecms::navigation.pages.create')}}
</a>
</div>
</li>
#endcanany
#can('admin')
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" role="button" data-toggle="dropdown"
aria-expanded="false">
{{ __('limplecms::navigation.user.management')}}
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="{{ route('users.index') }}">
{{__('limplecms::navigation.users.overview')}}
</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="{{ route('users.create') }}">
{{__('limplecms::navigation.users.create')}}
</a>
</div>
</li>
#endcan