All, in the recent Lumion 11.5 release something is broken when reading the .FBX file. See (1) for example. See (2) for fix. Another option is exporting model from SP in .SKP then opening in L. No issues with .SKP files.
UPDATE 6/16/21. I let lumion know that i posted the fix for this in the forum. They asked that i retract it and that they deal with it on a case by case scenario. Its all good. When i contacted them about the issue it was solved rather quickly. If you experience this issue send them an email. customercare@lumion.zendesk.com