Bewitchment does not take into account the existing spawn list weights when adding its hellhounds to all nether biomes. This creates an issue where their hellhounds (defaulting to 6 spawn weight) are VERY common in warped forest (to the point of swarming while just standing in warped forest).
Due to the nature of the spawning, the only fixes i can see to this are either remove it from the spawn list with kubejs or reduce the spawn weight (which would affect every biome) or add an additional enderman spawn to warped forest with a higher weight
This is all assuming that this was not fixed due to the intent to "increase" the "difficulty"