Multiple conf files on Nginx not working properly - nginx

Question

I'm trying to set up a docker container using Nginx default image and add a simple health route to it as proposed here.
My config is as follows, and I am placing it under /etc/nginx/conf.d/bacon.conf.
# bacon.conf
server {
listen 80;
location /health {
access_log off;
add_header 'Content-Type' 'application/json';
return 200 '{"status":"Healthy"}';
}
}
When I try to access this /health route I end up getting a 404.
I've noticed there is already a default conf file on etc/nginx/conf.d/ called default.conf.
# default.conf
server {
listen 80;
listen [::]:80;
server_name localhost;
#access_log /var/log/nginx/host.access.log main;
location / {
root /usr/share/nginx/html;
index index.html index.htm;
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
}
If I remove this default file from my container or if I merge both of them on a single file, my /health route starts working just fine.
I also checked nginx.conf under /etc/nginx which has this line:
#nginx.conf
...
include /etc/nginx/conf.d/*.conf;
...
From what I understand this should make NGinx mix all files ending in .conf into a single configuration file, shouldn't it?
For the sake of simplicity I would like to keep both files, how can I achieve this?