Following a request from Mark to describe the problem here, I’m adding more information.
Unless I did something incorrectly, I managed to query data from a table my role explicitly not allowed to using relation depth. I sent an email with reproducible scenario.
Sorry for the long reply. We have created a ticket (BKNDLSS-23883) for both cases described. Thanks for you issues. Our developers are already working on a fix. We will let you know when it is ready.