AND Condition not working on RQM REST API

Hello.

I have a Testcase named "tbf" with a description "abc".

I want to find by Title AND Description using REST API.
Doing the following call:

https://server/qm/service/com.ibm.rqm.integration.service.IIntegrationService/resources/PA/testcase?fields=feed/entry/content/testcase[title%3D%27tbf%27+and+description%3D%27xs%27]

which decoded is

https://server/qm/service/com.ibm.rqm.integration.service.IIntegrationService/resources/PA/testcase?fields=feed/entry/content/testcase[title='tbf' and description='xs']


As I am searching for the wrong description text, so I would expect not to get the Testcase as a Result.
Instead, I get any Testcases with the Title "tbf"
Name Uniqueness is disabled.
According to the wiki, it should work like that

?fields=feed/entry/content/testplan[title='test plan title' and description!='test plan description']/(title|description|testcase)

Include the title, description, and test case properties of the test plan(s) with a title property equal to 'test plan title' and a description property not equal to 'test plan description'.