WPGlobus not working when using htaccess

I have multiple WordPress-sites at same server in subdirectories and I have alias domains for each of them. I am having trouble with one of them. I’m using .htaccess RewriteRule as follows

RewriteCond %{HTTP_HOST} www.firstexamplesite.com$
RewriteCond %{REQUEST_URI} !firstexamplesite/
RewriteRule ^(.*)$ firstexamplesite/$1

The problem is I’m using WPGlobus-plugin to make site multilingual and it’s working fine when I am using site through that subfolder. For example:

Read More
www.myfirstsite.com/myfirstsite/en

But when I am using site directly

www.myfirstsite.com

Language swithing button doesn’t work. And when I’m trying to switch language directly, for example:

www.myfirstsite.com/en

I get that “Oops! That page can’t be found”-page of WordPress

I’m guessing problem is related to .htaccess-file, but not sure

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