[Bug] mountmodel broken in latest dev build

so... I updated MM today and I got this error (below) regarding - mountmodel on my mob. It worked fine before this.

MM v5.9.0-SNAPSHOT/5388

DriveTest:
  Type: SILVERFISH
  AIGoalSelectors:
  - clear
  AITargetSelectors:
  - clear
  Skills:
  - model{mid=cloudrider_mount;drive=true} @Self ~onSpawn
  - model{mid=cloudrider_mount;drive=true} @Self ~onLoad
  - mountmodel{mid=cloudrider_mount;m=walking;drive=true;delay=4} @trigger ~onInteract

Error:

[02:35:09 WARN]: [MythicMobs] ? Configuration Error in Mechanic CustomMechanic:NULL
[02:35:09 WARN]: [MythicMobs] --| Mob: DriveTest | File: /home/container/plugins/MythicMobs/mobs/something.yml
[02:35:09 WARN]: [MythicMobs] --| Error Message: Failed to load custom mechanic MOUNTMODEL
[02:35:09 WARN]: [MythicMobs] --| Mechanic Line: mountmodel{mid=cloudrider_mount;m=walking;drive=true;delay=4}
[02:35:10 WARN]: [MythicMobs] Failed to construct mechanic MOUNTMODEL
[02:35:10 WARN]: java.lang.reflect.InvocationTargetException
[02:35:10 WARN]:        at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:74)
[02:35:10 WARN]:        at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:502)
[02:35:10 WARN]:        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:486)
[02:35:10 WARN]:        at ModelEngine-4.0.8.jar//com.ticxo.modelengine.core21.mythic.utils.ModelEngineComponentRegistry.onMythicMechanicLoad(ModelEngineComponentRegistry.java:180)
[02:35:10 WARN]:        at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor203.execute(Unknown Source)
[02:35:10 WARN]:        at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:77)
[02:35:10 WARN]:        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80)
[02:35:10 WARN]:        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70)
[02:35:10 WARN]:        at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54)
[02:35:10 WARN]:        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131)
[02:35:10 WARN]:        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628)
[02:35:10 WARN]:        at MythicMobs-5.9.0-SNAPSHOT.jar//io.lumine.mythic.core.skills.mechanics.CustomMechanic.lambda$new$0(CustomMechanic.java:35)

(etc!)