Version 4 - UserHook generates always same hash through Database Seeds

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Factory.model('App/Models/User').createMany(30)

When I try to generate 30 users and I have this UserHook Code:

UserHook.generateEmailVerifiedKey = async (user) => {
  user.email_verified_key = await crypto.createHash('sha512').digest('hex')
}

In my user model:
this.addHook('beforeCreate', 'UserHook.generateEmailVerifiedKey')

I always get the same hash from the Hook Code and he can't insert the second user to the db.

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@thetutlage @RomainLanz any ideas? :/
Are hooks executed one way if you use createMany(50) for example?