Yes, this is just how fragments work; they're supposed to be stripped before sending the request to the server. This is exactly why, in the context of the thread, the fragment is the correct place to put the TSON hash parameter.
* = Including urllib.parse (Python), url_parse (PHP), java.net.URI (Java), System.Uri (.NET), net/url.URL (Go), curl_url_get (libcurl), URL (JavaScript, which calls it the "hash"), url::Url (Rust), Boost.URL (C++)