Describe the bug
It seams that using Assimp Viewer I am unable to export anything that contains an animation which also impacts AssimpNet and the more up to date AssimpNetter

Version: 5.4.3

To Reproduce
Steps to reproduce the behavior:

1. Import an fbx file that contains an animation (Use the C4d exported fbx for this example because the Mixamo fbx requires AI_CONFIG_IMPORT_FBX_PRESERVE_PIVOTS to be false and I cant find this option in the Assimp Viewer).
   C4D FBX
   Mixamo FBX
2. Confirm the animation plays.
3. Click Export and select FBX, GLTF 2, or anything that supports animation (I used FBX bin and ascii in this case).
4. Import the produced file in to any 3d modelling application that supports the format (I used Cinema 4D and also Assimp Viewer).

Expected behavior
The produced file should contain the animations

Actual behavior
The produced file does not contain the animations

Screenshots
Original:

Exported:

As you can see in the second screenshot the mesh has a T-Pose but the skeleton is posed from an animation frame but..... It might be worth mentioning that the mesh is still skinned to the skeleton. So If I were to import the produced file in to a 3d modelling application and rotate the bones, then the mesh would also deform.

I'll also add that i have tested with multiple FBX versions (2012, 2013, 2014-15, and 2016-17) and it doesn't seam to be a version specific issue.