You want to have Show Dielectrics checked, then turn on only one layer one by one to find out which layer has the outline with a hole in HFSS 3D layout. The Outline layer in HFSS 3D layout won't be transferred to HFSS. What you see might be a dielectric layer.
Please feel free to open a support case. This links shows how. https://courses.ansys.com/index.php/courses/ansys-customer-support-space/lessons/submit-a-support-case-in-the-ansys-customer-support-space/
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