Collection-link with limit?

In my situation, I have a collection of articles where one can select tags. I’ve predefined a number of tags in another collection and made a connection-link to that. I was hoping the “limit” option was to limit the amount of tags one could select. For example, I set the limit to 3 (or “3”, tried both), but I can still select more than 3.

How is this supposed to work? Or is “limit” meant for something else?