Wrong Animation Hierarchy

Hey everyone,
I use Unity 2019.3.1f1 and Blender 2.82 to Rig and animate Characters.
Til last week everything worked and i already exported three characters and animations into Unity.
First I export the Mesh with the rig and without the animations and then I export the animations without the mesh (only the rig).
But now the parent object (armature) in the animation is not shown in Unity, instead the first object is the child, so the hierarchies dont match anymore and the animation doesnt work.
When I try to export the previously working characters as new objects the same error occures.
When i import the fbx file in a new blender file the parent object still exists.
i have no idea what happend so any suggestions are welcome.

 

ah ok the preserve hierarchy fixes the problem, unity just didnt update... i still dont know why it's different from last week but im glad i found the misstake