DisplayName does not follow mounted mobs with disguises

When custom mobs use a player disguise the mobs display name does not follow the mob if it is mounted.

here is an image of the issue: [Legacy attachment omitted]

Here is the process I used to make this mob: /savedisguise SpearBandit player <inherit> setSkin spearman.png setDynamicName true setItemInMainHand iron_sword{CustomModelData:10} setHelmet air to make its disguise

SpearBandit:
  Type: Vindicator
  Options:
    PreventOtherDrops: true
    AlwaysShowName: false
  Display: "Bandit Spearman"
  Health: 30
  Damage: 5
  Mount: BanditHorse
  AlwaysShowName: true
  Equiptment:
  - IRON_SWORD HAND
  - AIR HEAD
  Drops:
  - COOKED_BEEF 1to3 0.2
  - spear 1 0.2
  Disguise: SpearBandit
  Modules:
    ThreatTable: true
  Skills:
  #- mount{t=BanditHorse} @self ~onSpawn
  - skill{s=ReachAttack} @target ~onAttack

BanditHorse:
  Type: Horse
  Options:
    Saddled: True
    HorseArmor: iron
    MovementSpeed: 0.4
    PreventOtherDrops: true