Why doesn't 404 work on sections in Bitrix?

Question

1C-Bitrix

Need help with 404 error handling. Site on Bitrix.
For example, if on the section pages:
https://website/uslugi/
https://website/information/
add characters after the slash:
https://website/uslugi/fgfhjdfgr The page says "Element not found".
But on the main page and about the company, it redirects to a 404 page.
How can I fix this?

htaccess file

Options -Indexes 
ErrorDocument 404 /404.php
 
<IfModule mod_php5.c>
  php_flag allow_call_time_pass_reference 1
  php_flag session.use_trans_sid off
 #php_value display_errors 1
  php_value mbstring.internal_encoding UTF-8
</IfModule>
 
<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine On

#del //
RewriteCond %{REQUEST_URI} ^(.*)/{2,}(.*)$
RewriteRule (.*) %1/%2 [R=301,L] 

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

#add /
RewriteCond %{REQUEST_URI} ^(.*/[^/\.]+)$
RewriteRule ^(.*)$ http://%{HTTP_HOST}/$1/ [R=301,L]

RewriteCond %{REQUEST_URI} ^(.*)/$
RewriteRule .* - [L]
RewriteCond %{ENV:REDIRECT_STATUS} 200
RewriteRule .* - [L]
RewriteCond %{REQUEST_METHOD} =GET
RewriteCond %{REQUEST_URI} ^(.*)/index.php$
RewriteRule ^(.*)$ %1/ [R=301,L] 

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-l
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !/bitrix/urlrewrite.php$
RewriteRule ^(.*)$ /bitrix/urlrewrite.php [L]
RewriteRule .* - [E=REMOTE_USER:%{HTTP:Authorization}]
 
</IfModule>
 
<IfModule mod_dir.c>
DirectoryIndex index.php index.html
</IfModule>
 
<IfModule mod_expires.c>
ExpiresActive on
ExpiresByType image/jpeg "access plus 3 day"
ExpiresByType image/gif "access plus 3 day"
ExpiresByType image/png "access plus 3 day"
ExpiresByType text/css "access plus 3 day"
ExpiresByType application/javascript "access plus 3 day"
</IfModule>

Answer 1

Depends on which component you are using.
For example, for bitrix:news.detail there are parameters that determine the behavior when a non-existent element is requested. So it turns out that if the SHOW_404 parameter is set to false, then the message "Element not found" will be displayed to the user, and if true, the contents of the 404 page