The Bug:

In some of the snapshots before 1.19 Pre-1, Allays gained the ability to, like other passive mobs, "panic" and flee when taking damage.

As of 1.19 Pre-1, despite no mention of this in the changelogs, this feature no longer works and is back to how Allays were in their first snapshots as they no longer react to damage.

How to Reproduce:

1. Spawn an Allay in 22w19a. Whether it is tamed or untamed, when it takes damage it will run around and "flee"
2. Do the same in 1.19 Pre-1 or any other versions this bug may affect. It will not react to the damage at all, simply floating there instead, potentially leaving it more vulnerable.

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The attached videos demonstrate this behavior in the two development versions.