FBX import/export addon

I have noticed that my animations don’t look the same from the project in the fbx file for some reason
Is there an issue with the fbx exporter in blender?

EDIT: I did some research and it appears that quite a few people had trouble with the lack of accuracy in the rotation of the bones that use copy rotation constraints or being baked. Will this issue be fixed in 2.81? Will the fbx exporter get a fix once an for all, cause it appears that this has been an issue since 2014