Different hitbox:Allay/Vex

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It is an intentional feature. Here is the changelog from the snaphot that says it : https://www.minecraft.net/en-us/article/minecraft-snapshot-22w45a

Vex

• Changes to Vex model and textures

  • The Vex retains a slightly oversized hitbox to make it easier to fight

Thank you for your report!
However, this issue is Working as Intended.

The report you have submitted is working as intended: as per the 22w45a changelogs.

Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.

Full Version History – Snapshot Version History – Feature Requests and Suggestions

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