Targeters are unable to detect display entities

Summary

• Greetings, I am trying to make a dungeon/gamemode where players have to run around and collect "shiny things" around the map.
• These "shiny things" are display entities (specifically ITEM_DISPLAY)
• There is a handler mob that targets all "shiny things" at the start of the game and increments a variable by 1 for every "shiny thing" on the map to display how many there are in total to find.
• This worked when I used armor stands, as I could target them using a filter, however after transitioning to display entities, there seems to be no filter for those in the targeters list.
• I would like to request the addition of display entities as a target filter. Thank you for your time!

Skills Used (Targeter fails to detect)

  - setvariable{var=world.shiniesCollectedMax;type=INTEGER;value=0} @self ~onSpawn
  - variableadd{var=world.shiniesCollectedMax;amount=1} @MobsInRadius{r=1024;types=Shiny} ~onSpawn

Example Display Entity

Shiny:
  Type: ITEM_DISPLAY
  Display: '&eShiny'
  DisplayOptions:
    Item: RAW_GOLD
    ViewRange: 64
    Scale: 0.75,0.75,0.75
    Translation: 0,1,0
  Options:
    Despawn: chunk
  Skills:
  - effect:glow{color=DARK_PURPLE;duration=40;audience=world} @self ~onTimer:20
  - setrotation{relative=true;yaw=3} @self ~onTimer:1