Rig works perfectly fine on Blender but is very broken on Roblox

Hello! Recently I commissioned a rig artist to rig a model for a project. They rigged it using control bones and very complicated methods that I fear are too complicated for Roblox’s engine. I did a small test animation to see if everything works fine and for some reason some areas of the face are stuck in place and look very broken. Does anyone know why it works fine on Blender and not Roblox?
(No shape keys were used in the rigging process)

The Blender animation:

The Roblox imported animation:

As you can see the rest of the body works perfectly fine but the head doesn’t.

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