@RomainLanz, yup i forgot the migrations update.
I tried your code, dump($user->getPermissions()); shows me this.
array:1 [
"internships" => array:4 [
"create" => false
"update" => false
"view" => true
"delete" => true
]
]
EDIT: Did you assign the role to user? Do a getPermissions() dump and see if it shows permissions properly.