This was the response from QB Support on this topic when I had the same question
The March 2021 release is not applicable to advanced queries and is only applicable to the actual field. Advanced queries work in a {Field.Operator.Value} format. We do apologize for the inconvenience. There are always ways to improve Quick Base and we welcome all suggestions. I would suggest posting this to our Feedback forums and sharing it with the community and our developers. You can access the Feedback forums by selecting the blue Feedback tab from the left-hand side of the My Apps page.
