Have you observed that in the same freezer?
In my experience, ice cubes sublimate in frost-free freezers, where you have a lot of air circulation keeping everything dry and, well, frost-free.
On regular freezers, frost accumulates even over the ice cube trays, and the ice cubes stay there, albeit with a terrible taste.
On regular freezers, air moisture (from when you open the door, or from moist food before it freezes) get in contact with the cold surfaces and freeze there. On frost-free freezers, the circulating air prevents that to happen, but does the same to the ice cubes.
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