Nginx does not serve/proxy path if it is missing ending slash

Hello dear Nginx users, being amateur user I wanted to ask You for your help.

My Nginx configuration is properly serving a webpage when visiting:
server.my.name
my.name
my.name/rooms
my.name/room/abc
my.name/r/abc/

but not when i visit:
my.name/r/abc
(note that same path works when it has trailing slash)

without slash, it redirects to my configuration file is:

# cat /etc/nginx/nginx.conf
Nginx does not serve/proxy path if it is missing ending slash WordPress ...