I have added a new subdomain on the server, so the address has been: subdomain.domain.org. The problem is that the subdomain matches a WordPress folder that already existed, ie domain.org/subdominio/, and is automatically redirecting to the new subdomain, which also has another manager installed, in this case phpBB.
The biggest problem is that WordPress is installed in public_html, and the subdomain has its installation folder there.
Is there any way to avoid it? I have searched for solutions, but all the questions go to the opposite side: redirect from a subfolder to a subdomain, when what I want is precisely to avoid it and that subfolder is in WordPress, without redirections.