The Bug:

The particles and head animations of ravagers in their roar preparation states aren't retained when their NBT data is reloaded.

When a ravager is preparing to roar, it will shake its head, along with producing some particles above its head. When a ravager's NBT data is reloaded while it's currently in its roar preparation state, it will no longer continue to shake its head or produce particles above its head. Additionally, particles from the roar itself when the ravager roars aren't produced.

Steps to Reproduce:

1. Construct a nether portal in the overworld and ensure that the nether dimension chunks are initially loaded.
2. Obtain a shield and summon a ravager.
3. Switch into survival mode so that the ravager begins attacking you.
4. Block the ravager's attacks using your shield and wait for it to get stunned and as a result, prepares to roar.
5. Quickly punch/push the ravager through the nether portal and then you yourself enter it as well.
6. Observe if the ravager is still shaking its head and producing particles while it's in its roar preparation state.
7. Observe if the ravager produces particles upon roaring.
8. Take note as to whether or not the particles and head animations of ravagers in their roar preparation states aren't retained when their NBT data is reloaded.

Observed Behavior:

The particles and head animations of ravagers aren't retained when their NBT data is reloaded.

Expected Behavior:

The particles and head animations of ravagers would be retained when their NBT data is reloaded.