Get all socket name dont return all bone but just one part of them

i dont have socket in my skeletal mesh

get all name socket return juste 1 branch
exemple :
Bone_003_end
Bone_003
Bone_002
Bone_001
Bone
Armature_001

but i have another bone but they are just ignored
normaly in skeleton
https://image.noelshack.com/fichiers/2018/35/4/1535648958-bone.png

myskeleton:

https://image.noelshack.com/fichiers/2018/35/4/1535648958-bone.png

Hello,

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Thanks

ok it my fault it great now