Models with "attachments" have incorrect animations.

[Pherakki]

Models such as chr680 have disconnect parts of the mesh, such as weapons, that fail to animate properly when the model in imported to Blender.
In the model editor, which operates by multiply transform matrices only instead of tiptoeing around Blender's use of individual transformation channels, the models animate correctly. This implies that either the tool or Blender constructs animations in a way that only causes bugs for animations with significant location channels. The cause of this needs to be identified, and if possible, corrected / worked around.