Blender FBX exporter exports all the bones when deformer only selected - User Feedback - Blender Developer Talk
FBX Export from Blender
Export Multiple Rigs as a single FBX : r/blender
Blender FBX import: secondary bone axis problem - Character & Animation - Unreal Engine Forums
Prevent Blender FBX Exporter adding extra root bone – Kris Redbeard
FBX to Blender export messed up bones (even though I enabled Import user options, automatic bone orientation, ignore leaf bones, import enums as strings, force connect children doesn't help much) Any on