In AppServiceProvider can't get result

[ronrun]

Describe the bug
Visit my http://example.org
The AppServiceProvider and welcome.blade.php have different result.

In AppServiceProvider

echo '<pre>'.print_r(app()->getLocale(), true).'</pre>';
echo '<pre>'.print_r(app()->currentLocale(), true).'</pre>';
echo '<pre>'.print_r(LaravelLocalization::getCurrentLocaleRegional(), true).'</pre>';
echo '<pre>'.print_r(LaravelLocalization::getCurrentLocale(), true).'</pre>';
echo '<pre>'.print_r(LaravelLocalization::getCurrentLocaleName(), true).'</pre>';
echo '<pre>'.print_r(LaravelLocalization::getCurrentLocaleNative(), true).'</pre>';

Result:
zh_Hant
zh_Hant
zh_TW
zh_Hant
Chinese (Traditional)
繁體中文

In welcome.blade.php:

{{ app()->getLocale() }}<BR>
{{ app()->currentLocale() }}<BR>
{{ LaravelLocalization::getCurrentLocaleRegional() }}<BR>
{{ LaravelLocalization::getCurrentLocaleName() }}<BR>
{{ LaravelLocalization::getCurrentLocaleNative() }}<BR>
{{ LaravelLocalization::getCurrentLocaleRegional() }}<BR>

Result:
en
en
English
English
en_GB

This is the same page. I can't find what went wrong.

To Reproduce
Steps to reproduce the behavior:

1. create laravel project
2. install mcamara/laravel-localization
3. edit the Kernel.php, web.php
4. edit the AppServiceProvider.php and dashboard.blade.php

This is en page, why shows zh_TW ?

config\laravellocalization.php

'supportedLocales' => [
    'en'          => ['name' => 'English',                'script' => 'Latn', 'native' => 'English', 'regional' => 'en_GB'],
    'zh_Hant'     => ['name' => 'Chinese (Traditional)',  'script' => 'Hant', 'native' => '繁體中文', 'regional' => 'zh_TW'],
    'zh_Hans'     => ['name' => 'Chinese (Simplified)',  'script' => 'Hans', 'native' => '简体中文', 'regional' => 'zh_CN'],
...
]

'localesMapping' => [
    'en' => 'en',
    'zh_Hant' => 'zh-Hant', //Taiwan
    'zh_Hans' => 'zh-Hans', //China
],

The zh_Hant is in the middle of the supportedLocales, why zh_Hant ?