The Bug

Post-1.19,2, in the snapshots intended for 1.19.3 and 1.20, Allays movement/AI has become bugged and behaves differently than expected compared to previous versions. While moving forward, especially while travelling quickly in order to follow a trusted player, often times they will stop, make a small circle, then fly forward once again. This behavior is inconsistent but happens frequently, as demonstrated below:

AllaySpinMovement120.mp4

Sometimes they may even spin more than once, delaying their movement even further;

AllayDoubleSpin120.mp4

This can be compared to their movement in 1.19, 1.19.1, and 1.19.2, where they wouldn't ever do this. They flew in a straight path, only sometimes wobbling a bit. This can be seen for comparison here:

AllayMovement119.mp4

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Steps to reproduce:

1. Have an Allay fly to you several times in 1.19.2, and observe how their movement behaves as expected
2. Do this again for 22w42a+
3. Observe how, though inconsistent, often times they Allay will stop to spin mid-flight

This bug slows down the Allays movement in its path towards the player, which is important for a mob that needs to be able to keep up.