Getting error 'Redirects to external URLs are not allowed by default'

Getting the error after created this .htacces in root folder.

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} !^/web
RewriteRule ^(.*)$ /web/

I want to redirect visitors to /web folder. I can login as Admin and enable modules, install themes and create content without any issues.

When a theme is installed, content created and publish it I get a blankpage with:

“Redirects to external URLs are not allowed by default, use DrupalCoreRoutingTrustedRedirectResponse for it.”

I have trusted hostsettings configured like this in settings.php

$settings['trusted_host_patterns'] = array(
'^my-domain.com$',
'^my-domain.com.web$',
'^.+.my-domain.com$',
'^.+.my-domain.com.web$',

according to this issue uncomment RewriteBase / didn’t work out either

Hope someone has a solution to this.

if (isset($GLOBALS['request']) and
'/subdirectory/index.php' === $GLOBALS['request']->server->get('SCRIPT_NAME')) {
$GLOBALS['request']->server->set('SCRIPT_NAME', '/index.php');
}