Factorio Forums

video demonstration attached

likely cause: i suppose there's a float flag which lerps the animation state between retracted and fully deployed onto position of wagon's fluid port. the target variable is updated instantly, regardless of animation status, and that causes it to snap.

potential fix: add another variable which stores previous position of fluid port, and use lerp range from -1 to 1, where 1 is fully deployed onto active position, 0 is fully retracted, -1 is fully deployed onto previous position

Thanks for the report however I don't believe we will be doing anything about this. It's simply not worth the time and effort for something that isn't causing any gameplay issues.