I've run on exactly same issue running Home Assistant, couldn't figure out why is that happening so I've came with a decent band-aid solution.   So to anyone still struggling and not giving up on those modules:   Rather than polling on interval ( which is things we rather avoid and don't want in our networks ) I've set an automation trigger on entity's power change to 0 - so exactly after the motor has stopped to force z-wave entity refresh on level value ( in home-assistant:
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