Interesting. My wild quess would be that the water started to freeze from the edges and eventually there was only a single unfrozen point. The water kept flowing out of that unfrozen point due to the ice getting thicker. When water freezes, volume increases, and in this case the total available volume (which seems to extremely tiny in the first place) under the ice decreases since the ice is held in place by the surrounding edges (in natural waters the ice floats above the water). The water was flowing out at a steady pace and the hole could not freeze shut, but the water froze around the unfrozen point when it spreaded around, creating this pillar that kept on growing in height, while liquid water had this unfrozen tunnel where it kept rising higher and higher until finally freezing shut.
So it may have been like a volcano, lava flows out and turns into solid after it cools down, figuratively speaking. It kept rising and rising until finally the flow slowed enough for the “volcano” to be frozen shut.
Edit: fixed formatting and spelling, typing from a phone
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