Json Schema compliance validation -- unexpected false pass

Using Ready-API I am attempting to set up Json Schema compliance assertion.

I have a local web server loading a plain text file with partial schema.

I am getting good response from the application under test.

To my great surprise I am getting unexpected false pass results from the assertion.

The schema specification is incomplete and does not properly match the actual result coming back from the server.

I would expect the assertion to fail ....

I am very worried about this unexpected pass result, it makes me completely distrust this assertion method.

Has anybody else seen this ?

Any thoughts ?

P.S. There is no documentation concerning the JSON schema assertion type on the smartbear website, I entered a support ticket about that last week but have received no response.   Does anybody know how it is supposed to work ?