Asynchronous entity add with ShootMechanic

[17:57:56 WARN]: java.lang.IllegalStateException: Asynchronous entity add!
[17:57:56 WARN]:        at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:15)
[17:57:56 WARN]:        at net.minecraft.server.v1_16_R3.WorldServer.addEntity0(WorldServer.java:1150)
[17:57:56 WARN]:        at net.minecraft.server.v1_16_R3.WorldServer.addEntity(WorldServer.java:1087)
[17:57:56 WARN]:        at org.bukkit.craftbukkit.v1_16_R3.CraftWorld.addEntity(CraftWorld.java:1978)
[17:57:56 WARN]:        at org.bukkit.craftbukkit.v1_16_R3.CraftWorld.spawn(CraftWorld.java:1985)
[17:57:56 WARN]:        at org.bukkit.World.spawn(World.java:2196)
[17:57:56 WARN]:        at org.bukkit.World.spawnEntity(World.java:2201)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.adapters.bukkit.BukkitEntityType.spawnEntity(BukkitEntityType.java:51)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.adapters.bukkit.entities.BukkitEndermite.spawn(BukkitEndermite.java:24)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.adapters.bukkit.BukkitEntityType.spawn(BukkitEntityType.java:30)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.mobs.MythicMob.spawn(MythicMob.java:715)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.skills.mechanics.SummonMechanic.castAtLocation(SummonMechanic.java:79)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.skills.SkillMechanic.lambda$executeTargetedLocationSkill$6(SkillMechanic.java:459)
[17:57:56 WARN]:        at java.base/java.lang.Iterable.forEach(Iterable.java:75)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.skills.SkillMechanic.executeTargetedLocationSkill(SkillMechanic.java:455)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.skills.SkillMechanic.executeSkills(SkillMechanic.java:411)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.skills.SkillMechanic.execute(SkillMechanic.java:325)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.skills.Skill.execute(Skill.java:270)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.skills.Skill.execute(Skill.java:245)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.skills.mechanics.ShootMechanic$ProjectileTracker.doEndSkill(ShootMechanic.java:401)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.skills.mechanics.ShootMechanic$ProjectileTracker.run(ShootMechanic.java:371)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.utils.Delegates$RunnableToConsumer.accept(Delegates.java:93)
[17:57:56 WARN]:        at io.lumine.xikage.mythicmobs.utils.Schedulers$LumineTask.run(Schedulers.java:162)
[17:57:56 WARN]:        at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftTask.run(CraftTask.java:99)
[17:57:56 WARN]:        at org.bukkit.craftbukkit.v1_16_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:54)
[17:57:56 WARN]:        at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22)
[17:57:56 WARN]:        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
[17:57:56 WARN]:        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
[17:57:56 WARN]:        at java.base/java.lang.Thread.run(Thread.java:832)

Using latest dev build on 1.16.4