php-fpm and symfony caching paths on subdomains?

Question

PHP

Similar question
stackoverflow.com/questions/27637369/nginx-with-mu...
But there are folders, and I have subdomains...
There is an nginx config where:
Symfony standard app 1 and Symfony standard app 2
2 separate applications on Symfony.
They differ only in the domain name and root directory.
The first is the main domain.
The second is a subdomain.
Default - subdomain with one index.php file

# Symfony standard app 1
server {
    server_name example.com;
    root /foo/.../web;
    location / {
        try_files $uri /app.php$is_args$args;
    }
    location ~ ^/(app_dev|config)\.php(/|$) {
        fastcgi_pass unix:/var/run/php5-fpm.sock;
        fastcgi_split_path_info ^(.+\.php)(/.*)$;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    }
    # ...
}

# Symfony standard app 2
server {
    server_name bar.example.com;
    root /bar/.../web;
    # ...
}

# Default /baz/index.php   <?php echo 1; ?>
server {
    server_name baz.example.com;
    root /baz;
    location / {
        try_files $uri /index.php;
        fastcgi_pass unix:/var/run/php5-fpm.sock;
        fastcgi_split_path_info ^(.+\.php)(/.*)$;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    }
}

When php-fpm is restarted, the following happens.
The first time you visit example.com, 1 app is launched.
Then, in a new browser tab, when you navigate to bar.example.com, application 2 is launched, but
everything in the vendor (composer) folder is pulled out of example.com.
And baz.example.com (just index.php) works as expected.
If you restart php-fpm.
And update bar.example.com first, then the situation repeats for example.com.
The error is quite interesting.
in AppKernel in method

class AppKernel extends Kernel
{
    public function registerBundles()
    {
        $bundles = array(
            new Acme\Bundle\AcmeBundle(), 
            // ..
        );

The Symfony error is thrown that Acme\Bundle\AcmeBundle was not found.
Valid for an application that will be initialized second.
Chrome, Firefox, curl, wget - doesn't matter...
But

class AppKernel extends Kernel
{
    public function registerBundles()
    {
        var_dump(new Acme\Bundle\AcmeBundle());
        exit();

        $bundles = array(
            new Acme\Bundle\AcmeBundle(), 
            // ..
        );

Displays an instance of this bundle.
Dumped the paths in both AppKernel and bootstrap.php.cache and others... The paths are normal.
For me, this is an extremely incomprehensible situation.