Wrong wp-admin URL

Eventually, I found the reason of this weird behaviour.

It is caused by the JavaScript embedded in wp_admin_canonical_url() (https://developer.wordpress.org/reference/functions/wp_admin_canonical_url/)

The URL is determined by this piece of code

$_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']

where the latter one returns wp-admin instead of hello/wp-admin.

By manipulating the value in $_SERVER['REQUEST_URI'], I can successfully get the correct behaviour in admin dashboard. But I still hope for an elegant solution without touching WordPress code.

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