Buoyancy diffusion not working

[Booyaka]

You don’t seem to write back any data to the buoyancies array, you’re just writing values to the userData array.

Check the Raclette sample scene for reference. You need to write the userData values back to the array you wish to use, in this case, the buoyancies array.

I can't find the problem. Everything is just like "Melt" & "ViscositySurfTensionToUserData" scripts in Raclette sample.
Could you please mention it more precisely?

The weird thing is that the code will work for color but not any other parameters like viscosity, buoyancy, etc.