Rigify FBX export problem

Using Rigify rig I have an FBX export problem, the limbs in the animation appear shorter for a reason I fail to understand (I can only guess it has something to do with Rigify functionality), I tried quite a few things in attempt to fix it yet nothing worked. Don’t pay attention to the hierarchy of the exported FBX file (it contains unnecessary bones) - I know how to fix that. I setup this tiny scene to demonstrate my problem. I has the metarig, the generated rig and an exported-imported FBX skeleton. Any help would be greatly appreciated!