Niagara - Variable is used, but its source variable is not set

Development Asset Creation
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Everything is in the title.

I work with few niagara system VFX, everything was working fine until right now, I’ve many compile error on some of them, “Variable Particles.Initial.Scaling is used, but its source variable Particles.Scaling is not set!”. Happen from nowhere, don’t touch anything so I’m a bit lost about that.

How can I solve this please ?

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Up

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Tried on another UE5 project + A fresh blank UE5 project, same issue. But FX works on a 4.27 project.

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I’ve tried many things but can’t solve the issue. Any help would be very appreciated, I’m totaly lost against this.

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Very unique issue, no one is talking about on internet, but reinstall unreal solved it.

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i have the same. Particle read DI is trying to access inexistent variable 'fluids_source_previous_radius in the output log. the fluid is working but don’t find a solution