There's no water there. The ice is from when the water was higher. When it receded, it left a sheet of ice several inches above some muck. When you walk across, the ice breaks but keeps you from sinking in the muck.
Happens if you get snow then thick ice plus modest temps. The top layer of ice is thick enough to stay together as the snow below melts away, then you have a layer of ice over an air gap and grass.
Same effect as when you walk through snow and the top is rock solid but the inside is powdery. Just trickier to happen.
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u/OkOutlandishness8307 2d ago
people walking on frozen lakes make me so anxious especially when it’s cracking