Issues with the Figma for Jira application

We’re using the Figma for Jira plugin to attach Figma designs to Jira stories. I want to use a query to show stories that do not have a design attached, so I’m using design[totalCount]=0 as a parameter. This works in our UX project, bit it does not show results for stories that match that parameter in our engineering project. However, design[totalCount] >=1 DOES work correctly in both projects. We opened a support ticket with Atlassian, but after investigating, they’re saying it’s a problem with the Figma plugin, which they do not support. Why would the term design[totalCount]=0 work in one project but not another?