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Yes open and take the egg out and then close the incubator back up quickly. If it seems that humidity doesn't recover quickly add damp paper towels are spray warm mist up up the humidity.

https://www.backyardchickens.com/articles/step-by-step-guide-to-assisted-hatching.64660/. Take the time to read the assisted hatch article. In my experience ducks take longer to do each hatching step.