Particles are rendered differently depending on whether or not clouds are enabled with the "Fabulous!" mode

Can confirm.

I've noticed that when clouds are off, and graphics are set to Fabulous!, the particles appear to be doubled up. This could be related to MC-278096 or possibly duplicate it.

See the top right edges of the smoke particles:

Thank you for your report!
We're tracking this issue in MC-278096, so this ticket is being resolved and linked as a duplicate.

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Thank you for your discovery with the clouds, despite this being a duplicate. It allowed me to confirm the parent report. 🙂