Ferdinand Joseph Fernandez
Mar 4, 2019
Editing the rig of a Blender file breaks regular prefabs that use it (this was a long-standing issue that was never fixed). As far as I know, this problem only happens in Blender since its FBX exporter is limited, compared to Autodesk products like Maya and 3dsmax.
But the new Prefab Variant feature in Unity 2018.3 effectively solves this issue because variants keep the "connection" to the blend file intact. This works because Unity treats blend files as prefabs themselves.