Why are the temporary winter greens currently No Play Zones (NPZ) not just GUR? Because we are trying to protect them as much as possible prior to use.
If your ball lies in an NPZ, you must take relief, and you must also do so if it interferes with your area of intended stance or area of intended swing in playing a ball outside the NPZ (e.g., if your follow-through would create a divot in the NPZ even though your ball lies outside it).
[relief under Rule 16, means dropping within one club-length of your nearest point of complete relief not nearer the hole. You must take full relief, so can’t still be standing in the GUR / NPZ after taking your drop]
