What to do if robots.txt is cached on cms Wordpress?

Question

caching

This is not the first time I have come across sites where, no matter how you update the original robots.txt file, it still displays without edits. But if I open it as robots.txt ?nocache , I see the file I need.
Tried to clear the cache on the WP side with all the plugins I found, there is nothing that definitely helps.
How to be in this situation? What needs to be done so that robots.txt is displayed immediately after making changes to it?

Answer 1

win+R -> cmd -> curl domain.com/robots.txt
See content. If it is cached even there, then first look at the caching plugins, if they are not there, then the nginx caching policies.