Exporting FBX files – geometry with visibility turned off still visible upon import into other progr…

I have a custom program that can import FBX files. This program then renders the animations. This program was built using the FBX SDK. Apparently, there is a “hidden” flag that can be read from the FBX file, but when selecting visibility to “off” on geometry, this geometry does not have the “hidden” flag attached to it after exporting the FBX.

Is there another way I can make sure that hidden geometry does not show as visible upon exporting the FBX file?

EDIT: Apparently, even setting keys for the specific geometry’s “visibility” attribute isn’t enough to hide the geometry… That’s really odd.. Why wouldn’t the FBX file export the animation with the geometry not visible when I specifically set keys for its visibility to “off”?