The Bug:

Although they cannot clip through blocks like Vex, sometimes Allays sink too far into the ground randomly while flying which causes their shadow to disappear. It will come back after they move upwards a bit.

How to Reproduce:

1. Observe an allay flying around, or picking up items off the ground
2. You will see how sometimes they clip into the ground causing their shadow to disappear

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Initially I thought this bug was because of the Allay model clipping through the ground as it only seemed to happen when the model touched the ground, however its possibly related to MC-226887 and is instead dependent on the angle the shadow is rendered