Mesh won't merge bones to it's own armature

Development Character & Animation
2

Same problem here, “FAILED TO MERGE BONES” error, because now it exports ‘Armature’ on top of hierarchy… With UE 4.8.0 and Blender 4.74 it was working fine, i didn’t changed anything in my Blender → UE export workflow.
Has anyone figured out how to correctly export skeletal mesh from the newest Blender (4.75) to the newest UE (4.8.2)?