How to set paths (aliases) when directory structure changed?

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Hi. Thank you for releasing Yii3.

I am used to have separated public and private files into two directories: public and private.

I made fresh Yii3 application installation:
cd /path/to/directory
composer create-project yiisoft/app private
cd private
mv public ..

So I have:

> private
>> config
>> src
>> vendor
>> yii
>> (...)

> public
>> index.php
>> (...)

Then I changed config/common/aliases.php to correspond new directory structure.

From this:

return [
    '@root' => dirname(__DIR__, 2),
    '@src' => '@root/src',
    '@assets' => '@root/public/assets',
    '@assetsUrl' => '@baseUrl/assets',
    '@assetsSource' => '@root/assets',
    '@baseUrl' => '/',
    '@public' => '@root/public',
    '@runtime' => '@root/runtime',
    '@vendor' => '@root/vendor',
];

To this:

return [
    '@root' => dirname(__DIR__, 3),
    '@src' => '@root/private/src',
    '@assets' => '@root/public/assets',
    '@assetsUrl' => '@baseUrl/assets',
    '@assetsSource' => '@root/private/assets',
    '@baseUrl' => '/',
    '@public' => '@root/public',
    '@runtime' => '@root/private/runtime',
    '@vendor' => '@root/private/vendor',
];

As suggested in common/configuration.php, I ran command to update merge plan:
composer yii-config-rebuild

Then I started PHP built in server:
APP_ENV=dev ./yii serve --port=8080

And got warning and error:

[WARNING] Default router "public/index.php" does not exist. Serving without router. URLs with dots may fail.
[ERROR] Document root "/path/to/directory/private/public" does not exist.

What am I doing wrong? How to correctly set paths to communicate private and public directories with each other?