mounttarget not work in 1.21.3

The mounttarget does not work with paper-1.21.3 but works correctly with 1.21.1. It seems the event behavior has changed in version 1.21.3.

Steps to reproduce

Use paper-1.21.3-82. Add the following configuration:

test_mount: Type: PIG Skills:

• mounttarget{delay=2} @trigger ~onDamaged
• remove{delay=120} @self ~onSpawn

Spawn the mount and trigger hit the mob Current behavior

The ~mounttarget event does not activate the skill as expected in version 1.21.3.

Intended correct behavior The event should activate the mounttarget skill as it does in version 1.21.1.