Sentry with PHP and nginx: errors do not occur in sentry dashboard anymore

I am stuck with my nginx (nginx/1.14.2) configuration for a php (php-7.4) App that would normally send error notifications to sentry.

I moved a php application from an apache to nginx server and now my sentry errors are not reported anymore ... what did I do wrong?

here is my nginx config:

server {

    root /var/www/services/some-sesrvice;

    index index.php;

    server_name *****.com;

     access_log /var/log/nginx/some-service.access.log;
     error_log /var/log/nginx/some-service.error.log;

    location / {
        try_files $uri $uri/ /index.php;
    }
    location ~ .php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/var/run/php/php-fpm.sock;
    }

    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/*****./fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/*****./privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}
server {
    if ($host = *****.com) {
        return 301 https://$host$request_uri;  
    } # managed by Certbot


    listen 80;
    listen [::]:80;

    server_name *****.com;
    return 404; # managed by Certbot


}

and my php call

    Sentry\init(['dsn' => 'https://*****.ingest.sentry.io/***' ]);
    throw new Exception("Sentry is working on ".$_ENV['ENV']." machine!");

While composer is installed using this composer.json part

"require": {
        "sentry/sdk": "^3.1",
....

Any ideas or any ideas how to debug this?

UPDATE

The error log file finds this (so the error is captured):

2021/07/02 13:22:12 [error] 17232#17232: *193 FastCGI sent in stderr: "PHP message: PHP Fatal error:  Uncaught Exception: Sentry is working on TEST machine! in /var/www/services/some-service/Config/sentryloader.php:13
Stack trace:
#0 /var/www/services/some-service/Config/bootstrap.php(15): include()
#1 /var/www/services/some-service/index.php(6): include('/var/www/servic...')
#2 {main}
  thrown in /var/www/services/some-service/Config/sentryloader.php on line 13" while reading response header from upstream, client: ****ip****, server: ****.com, request: "GET /get HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php-fpm.sock:", host: "****.com"

UPDATE: snippets/fastcgi-php.conf :

# regex to split $uri to $fastcgi_script_name and $fastcgi_path
fastcgi_split_path_info ^(.+?\.php)(/.*)$;

# Check that the PHP script exists before passing it
try_files $fastcgi_script_name =404;

# Bypass the fact that try_files resets $fastcgi_path_info
# see: http://trac.nginx.org/nginx/ticket/321
set $path_info $fastcgi_path_info;
fastcgi_param PATH_INFO $path_info;

fastcgi_index index.php;
include fastcgi.conf;