Why does a 302 redirect from slash to no slash happen?

Question

Nginx

Hello, please tell me, there seems to be nothing in the config about redirects from a slash to without a slash, but for some reason such a redirect occurs. Has anyone encountered this? .htaccess doesn't work because apache is not on the server. The site itself does not seem to do such a redirect either.

# www redirect
server {
    listen       {ip}:80;
    server_name  www.domain.com;

    add_header   Cache-Control "max-age=315360000, public";
    add_header   X-Frame-Options "DENY";

    root         /var/empty;

    return       301 https://domain.com$uri;
}


server {
    listen       {ip}:443 ssl;
    server_name  www.domain.com;

    ssl			       on;
    ssl_certificate            /etc/nginx/certs/domain.com.chained.crt;
    ssl_certificate_key        /etc/nginx/certs/domain.com.key;


    add_header   Cache-Control "max-age=315360000, public";
    add_header   X-Frame-Options "DENY";

    root         /var/empty;

    return       301 https://domain.com$uri;
}


# HTTP -> HTTPS redirect
server {
    listen       {ip}:80;
    server_name  domain.com;

    root        /var/www/domain.com/site/public;

    location = /robots.txt {
       break;
    }

    location = /sitemap.xml {
        break;
    }

    location / {
        add_header   Cache-Control "max-age=315360000, public";
        add_header   X-Frame-Options "DENY";

        return       301 https://domain.com$uri;
    }
}


server {
    listen      {ip} ssl http2;
    server_name domain.com;


    root      /var/www/domain.com/site/public;
    error_log /var/www/domain.com/logs/error.log;

    index     index.html index.htm index.php;
    
    include   includes/deny-files.conf;

    # SSL
    add_header  Strict-Transport-Security "max-age=0;";
    ssl                        on;
    ssl_protocols              TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
    ssl_stapling               on;
    ssl_stapling_verify        on;

    ssl_buffer_size            8k;

    ssl_certificate            /etc/nginx/certs/domain.com.chained.crt;
    ssl_certificate_key        /etc/nginx/certs/domain.com.key;

    ssl_ciphers                "code";
    ssl_prefer_server_ciphers  on;

    ssl_session_cache          shared:SSL:10m;
    ssl_session_timeout        10m;

    # gzip
    gzip                       on;
    gzip_comp_level            5;
    gzip_types                 text/plain text/css text/javascript application/javascript application/json application/x-javascript text/xml application/xml application/xml+rss font/opentype application/font-woff application/x-font-woff font/woff font/woff2 application/font-woff2  image/svg+xml;

    client_max_body_size 64m;
    charset	         utf-8;    
    
    # pagespeed config
    pagespeed on;

    # Needs to exist and be writable by nginx.  Use tmpfs for best performance.
    pagespeed FileCachePath /var/ngx_pagespeed_cache;

    # Ensure requests for pagespeed optimized resources go to the pagespeed handler
    # and no extraneous headers get set.
    location ~ "\.pagespeed\.([a-z]\.)?[a-z]{2}\.[^.]{10}\.[^.]+" {
       add_header "" "";
    }
    location ~ "^/pagespeed_static/" { }
    location ~ "^/ngx_pagespeed_beacon$" { }

    pagespeed Disallow "*.svg";
    pagespeed DisableRewriteOnNoTransform off;
    pagespeed RespectVary off;    
    pagespeed LowercaseHtmlNames on;
    pagespeed AddResourceHeader "Access-Control-Allow-Origin" "https://domain.com";

    
    # static caching	
    location ~ \.(js|css)$ {
        add_header                 Cache-Control public;
        fastcgi_hide_header        Set-Cookie;

        open_file_cache            max=10000 inactive=14d;
        open_file_cache_errors     on;
        open_file_cache_min_uses   3;
        open_file_cache_valid      1m;
        output_buffers             1  2m;

        expires                    14d;
        etag			   		   on;	
    }

    location ~ \.(png|PNG|jpg|JPG|jpeg|JPEG|gif|swf|ico|svg|otf|tiff|woff|woff2)$ {
        add_header                 Cache-Control public;
        fastcgi_hide_header        Set-Cookie;

        open_file_cache            max=10000 inactive=31d;
        open_file_cache_errors     on;
        open_file_cache_min_uses   3;
        open_file_cache_valid      1m;
        output_buffers             1  2m;

        expires                    200d;
        etag                       on;
    }


    location / {
        try_files $uri $uri/ /index.php?$args;
    }


    location ~ \.php$ {
        fastcgi_pass            unix:/run/php/php7.1-fpm.sock;
        fastcgi_index           index.php;
        fastcgi_param           SCRIPT_FILENAME  $document_root$fastcgi_script_name;
    fastcgi_param HTTPS     on;
        fastcgi_connect_timeout 120s;
        fastcgi_read_timeout    300;
        include                 fastcgi_params;
    }
}

Thank you in advance for your response