Ominous item spawners still spawn regular arrows instead of tipped arrows. While they are functional, they are visually indistinguishable from arrows with no effects, and do not stack with such arrows.

Steps to reproduce:

1. Run

   /loot give @s loot minecraft:spawners/trial_chamber/items_to_drop_when_ominous

   or play an ominous trial a couple of times, and then run

   /data get entity @n[type=!player]

   when near an arrow with effects fired by an ominous item spawner.

Observed result:
Ominous item spawner spawns a normal arrow (minecraft:arrow) with potion effects. These appear as "7 components" in the inventory and do not stack with regular arrows.

Expected result:
Ominous item spawner spawns a tipped arrow, minecraft:tipped_arrow.