Weirdly enough, the center of the spiky star balls in Ice Starfield biome always has a single air block with nothing in it. Not sure if this was supposed to be filled in or if a special block was suppose to be put there instead.

This might be the strangest thing I've ever seen, lol.

Oddly enough, large and small Umbrella Trees also has a similar thing where the center of their base has an air block always.

Blossoming Spires's spikes, some of the Dragon trees, and the giant glowing mushrooms too. I wonder if this is a structure block or some sort of marker block not being removed properly?