SXA-specific search queries might return wrong or empty results in the Build Search Query dialog box compared to those returned by the SXA Search service. The issue happens because Sitecore Experience Accelerator (SXA) has its own indexes that contain custom fields, but the Build Search Query dialog box queries against the Sitecore index.
We recommend that you do not rely on the results returned in the Build Search Query dialog box and that you test your queries with SXA search components or directly through SXA search API.