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Bug - Postprocessing material not compiling when parameter promoted

Hi everyone,

I’m facing something I cannot figure out. It really looks like a bug. I have a simple postprocessing material as you can see in attached pictures. In a clamp, I have Min=0 and Max=1, when I promote “Min” parameter, which is by default at value 0, it shouldn’t change my render at all. BUT, the material doesn’t compile anymore. If I delete this promoted parameter, it compiles again.
I’ve tried many things without succeeding. It seems bugging at this step of the graph only, because if I promote other parameters it works.
Please find my scene zip here : https://drive.google.com/open?id=1aY5dqTTOEOCfTQuU1AN7rZGvfmXrLbR_

Thank you for your help !