Weird water glitch

The water block disappeared and the farmland turned blue at the edges. At the time I was playing on a LAN world and there were only 3 players with one quite far away. We were keeping the ice from it (ice plains biome) with small pillars in the water with a torch on top when i noticed that the water block has disappeared and the soil had turned blue. First I thought this was something that they have added but then i realised it changed when i looked at it a different way.