Missing API for accessing targets of mobs using new AI brain system

Expected behavior

That getTarget() returns the entity the axolotl is currently targeting, and that setTarget(null) clears targeting.

Observed/Actual behavior

getTarget() returns null, even when the axolotl is attacking another entity. Setting the target to null also does nothing.

Steps/models to reproduce

Reproduced this using the following code:

@EventHandler
    public void onAxolotlAttack(EntityDamageByEntityEvent event) {
        if (event.getDamager() instanceof Axolotl axolotl) {
            if (axolotl.getTarget() != null)
                getLogger().info(String.format("Target type: %s", axolotl.getTarget().getType().name()));
            else
                getLogger().info("Target is null");

            axolotl.setTarget(null);
        }
    }

The output will be the "Target is null" message each time, and the axolotl continues attacking.

Plugin and Datapack List

Plugins (1): TestPlugin

There are 2 data packs enabled: [vanilla (built-in)], [file/bukkit (world)]
There are no more data packs available

Paper version

This server is running Paper version git-Paper-359 (MC: 1.17.1) (Implementing API version 1.17.1-R0.1-SNAPSHOT) (Git: bc43f40)
You are running the latest version

Other

No response

Start by reproducing the issue with the provided Axolotl event-handler snippet, then inspect the mob target API and the new AI brain system. Done means getTarget() returns the entity currently being attacked and setTarget(null) clears targeting, as described in the expected behavior.