The script does not work to the end when writing to a file. Why?

Question

PHP

There is a vagrant (virtualbox) box - homestead/laravel ( https://laravel.com/docs/7.x/homestead).
It runs a Symfony project.
In nginx config -

server {
    listen 80;
    listen 443 ssl http2;
    server_name test.local;
    root "/home/vagrant/test.local/public";

    index index.html index.htm index.php;

    charset utf-8;



    location / {
        try_files $uri $uri/ /index.php?$query_string;

        fastcgi_read_timeout 99999999;
        fastcgi_connect_timeout 99999999;
        proxy_read_timeout 99999999;
        proxy_connect_timeout 99999999;
        proxy_send_timeout 99999999;
        send_timeout 99999999;
    }

    location = /favicon.ico { access_log off; log_not_found off; }
    location = /robots.txt  { access_log off; log_not_found off; }

    access_log off;
    error_log  /var/log/nginx/test.local-ssl-error.log error;

    sendfile off;

    # DEV
    location ~ \.php(/|$) {
        fastcgi_split_path_info ^(.+\.php)(/.*)$;
        fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

        fastcgi_read_timeout 99999999;
        fastcgi_connect_timeout 99999999;
        proxy_read_timeout 99999999;
        proxy_connect_timeout 99999999;
        proxy_send_timeout 99999999;
        send_timeout 99999999;

        #fastcgi_intercept_errors off;
        fastcgi_buffer_size 128k;
        fastcgi_buffers 8 128k;
    }

    location ~ /\.ht {
        deny all;

        fastcgi_read_timeout 99999999;
        fastcgi_connect_timeout 99999999;
        proxy_read_timeout 99999999;
        proxy_connect_timeout 99999999;
        proxy_send_timeout 99999999;
        send_timeout 99999999;

    }

    ssl_certificate     /etc/nginx/ssl/test.local.crt;
    ssl_certificate_key /etc/nginx/ssl/test.local.key;
}

/etc/php/7.4/fpm/php.ini contains

max_execution_time = 9999999
max_input_time = 9999999
memory_limit = 1024M

/etc/php/7.4/fpm/pool.d/www.conf does not specify request_terminate_timeout.
Everything is empty in the logs, I noticed that even the logs do not add (in the screenshot)

stupid break

The script itself executes a cycle - creates an excel file (PhpSpreadsheet) and writes to it line by line. The file is created in public/files. The rights to this folder are 777. In general, everything is written and created, but cut off.

set_time_limit(0) in script doesn't help. Generally a help.

UPDATE--------------------------------
Also added to nginx, but it didn't change the situation :

fastcgi_buffer_size 1024k;
fastcgi_buffers 16 1024k;

UPDATE------------------------
Uploaded to the hosting, the same thing only the execution time is different . It still gets cut off.
The hosting is also nginx.