Does an https subdomain redirect to the main site?

Question

Apache HTTP Server

There is a VPS, where the site is running on Apache.
There was such a dilemma.
there is a subdomain dev.site.ru - where, as a rule, I make it up and then transfer it to the main one.
The main site looks like this https://www.site.ru (everything is redirected to it by these directives in Apache

RewriteCond %{HTTP_HOST} ^сайт\.ru$ [NC]
RewriteRule ^(.*)$ https://www.сайт.ru/$1 [L,R=301]

RewriteCond %{HTTPS} off
RewriteCond %{HTTP:X-Forwarded-Proto} !https
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Accordingly, the site
dev.site.ru - a separate config has been created, and if you go via http, then the site is available just a test one,
but if you go via
https:/dev.site.ru or https:/www.dev.site.ru
or dev.site.ru , then for some reason the main site opens.

It turns out that my test is available only at
http:/dev.site.ru

It's strange, who came across it? how to treat?

Answer 1

How strange, who faced? how to treat?

And to show configs - not destiny? ;)