When the water is filling the ice cube maker, there is a slight leak at the junction just inside the rear wall of the fridge. The water leaks into the bin, and after repeated fillings, the water in the bottom of the bin becomes a solid block of ice.
See if the full tube is blocked with ice causing it to leak.The water inlet valve on the back of the unit where the water supply comes in can have a slow leak and will cause ice to buildup and block the fill tube. Disconnect the ice maker line from the valve and watch to see if it has a slow drip. It doesn’t take much to eventually block the fill tube.
The valve can leak because of sediment in the water preventing it from closing or low water pressure.
Or take the fill tube out and inspect for cracks
Removed the water fill tube and found that the end was cracked and frayed, thereby not allowing all the water to make it to the cube tray. Ordered a new water fill tube.