Issues when removing a book from a shelf

[Gunther]

I am having some issues with the shelves.add_to_shelf endpoint

Adding a book to a shelf works for me, but removing doesn't

According to the documentation if you add the parameter "a" with value "remove" it should remove the book from the shelf
I did that and i receive a HTTP 200 OK response, but when i look on my shelf it's still on there

the request:

POST https://www.goodreads.com/shelf/add_t... HTTP/1.1
Accept-Encoding: gzip, deflate
User-Agent: RestSharp/4.0.7
Authorization: OAuth oauth_consumer_key="xxxxxxxxxx",oauth_nonce="xxxxxxxxx",oauth_signature="xxxxxxxxxx",oauth_signature_method="HMAC-SHA1",oauth_timestamp="xxxxxxxxxx",oauth_token="xxxxxxxxxxxx",oauth_version="1.0"
Host: www.goodreads.com
Content-Length: 0
Connection: Keep-Alive

the response

<?xml version="1.0" encoding="UTF-8"?>
<hash>
 <name>read</name>
 <status>removed</status>
</hash>

Can someone confirm this is an actual bug?