Bendy Bone Rig Not Working (Roblox/Blender)

So i’ve been strugling with this alike “Bendy” part of my mesh, bassicaly when i export it from blender to Robloxstudio the Bendy part just disappears and the top and main part gets dislocated.

In Blender works fine but in Roblox Studio doesn’t

Roblox Studio POV:

Maybe its not adapted to regular bones and it detects only the normal ones?
But since i writing this post how could i also replace that part with something that gets detected by roblox studio has “Bone”.

Any comments are appreciated.

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If you add more bones or depending on what you want, add a bone at the end and weight-paint the rest of the mesh so that it deforms with the bone.

I recommend weight-painting the rest of the mesh to a bone at the end (make sure its still connected to the armature.