$referer has no query string

[212223]

No matter the request (with or without filters) $referer is always lacking a query string.
Therefore return is always executed and the self::FIRST_PAGE never returned.

That leads to the issue in case a user's browser is displaying for example the 5th page

but a user makes a new search request with updated filters and a response does not have at least 5 pages:

Expected behavior would be to display always the 1st page of results every time a user requests a new page with changed filters: