Phalcon and Nginx - download php file instead execute when in first level - php

Question

I have problem with Nginx and Phalcon configuration.
This is my server block:
server {
listen 80;
server_name testapp.dev;
root /srv/http/testapp/public;
index index.php index.html index.htm;
charset utf-8;
location / {
try_files $uri/ /index.php?_url=$uri&$args;
}
location ~ \.php$ {
fastcgi_index index.php;
fastcgi_pass unix:/run/php-fpm/php-fpm.sock;
include fastcgi_params;
fastcgi_param PATH_INFO $fastcgi_path_info;
fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
}
location ~ /\.ht {
deny all;
}
}
It's from Phalcon website: https://olddocs.phalconphp.com/en/3.0.0/reference/nginx.html
Everything is ok until I don't enter into browser address like this (when there is "Test" module): testapp.dev/test. But it works when I pass testapp.dev/test/ or testapp.dev/test/part or testapp/test/part/.
Interesting is, that if I enter name of module that don't exist, for example: testapp.dev/test2, it executes index file and shows error that module definition path doesn't exist.
To summary above:
testapp.dev/test - not working
testapp.dev/test/ - working
testapp.dev/test/part - working
testapp.dev/test/part/ - working
testapp.dev/test2 - module not exist, but index is executing, so, it's working
testapp.dev/test2/ - like above...
When I enter into: testapp.dev/index.php?url_=/test it's working.
First thought - I should try add / at the end of try_files directive, but when I insert it, it's not working either.
I tried also this:
Phalcon and nginx - framework run only indexController. It's like above...
Also I was trying to add trailing slash like this: https://serverfault.com/questions/645667/php-file-downloaded-instead-of-executed-with-nginx-try-files, but no success.