360 Panorama with Black Seam

Hi, I’m using the panoramic camera to render a basic scene for a 360x180 panorama. I switch to equirectangular type, and output at 4k resolution. When I view it in a panoramic viewer, there is a large black seam on the opposite side of the default view (feels like it’s directly behind you when you start the default view). Everything looks great, except the side behind you. Does anyone know whats wrong?

Hard to tell without seeing what that large black seam looks like exactly. Could be some kind of render error, camera clipping, problem with the viewer etc.