Nginx proxy pass converting %7c to pipe '|'

Question

Problem- I have a url say https://example.com/app/something%7Csomething but when i pass it via proxy pass in nginx to make it look like https://example.com/api/something%7Csomething, it changes the %7c to a '|' and throws an error.

Nginx conf-

location /api/ {
      proxy_pass https://example2.com/;
  }

How should I prevent this change?