config:cache is being duplicated

[Nguyễn Trần Chung]

I created module core

{
    "name": "Core",
    "slug": "core",
    "version": "1.0",
    "description": "Core module. This is required module!"
}

then I create config core.php in app\Modules\Core\config\core.php

<?php
return [
    'brand' => 'My Blog'
];

config('core') return:

array:1 [▼
  "brand" => "My Blog"
]

This is no problem when I run: php artisan config:cache
and config('core') return:

array:1 [▼
  "brand" => array:2 [▼
    0 => "My Blog"
    1 => "My Blog"
  ]
]

[Nguyễn Trần Chung]

I try comment $this->loadConfigsFrom(__DIR__ . '/../config'); in app\Modules\Core\Providers\ModuleServiceProvider.php => no problem

[Nguyễn Trần Chung]

ping @kaidesu

[Nguyễn Trần Chung]

This is an important issue, is anyone like me?

[Nguyễn Trần Chung]

@kaidesu I know you working hard, but I feel anxious every time I update composer