Why has the https admin area become unavailable in the K2 module?

Question

Joomla

Hello. Unfortunately, I couldn't find an answer to my question on Google. There is a site, on it there is a K2 module. The same Joomla module. No settings - nothing. no description online.
I redirected from http to https. As a result, using the https protocol, it just throws me into the authorization window. As in the screenshots
joxi.ru/v29R1vZiE3Z9AG
joxi.ru/L215aNyfX8Re2X
Works fine without https.
Tried to throw an exception
RewriteCond %{SERVER_PORT} !^443$
RewriteCond %{REQUEST_URI} !^/k2/admin/$1
RewriteRule ^(.*) https://site.ru/$1 [R=301,L]
Didn't work.