[structures.spawner_dungeon]
#Generate? [default: true]
generate = true
#Spawn Chance [default: 0.7]
#Range: 0.0 ~ 1.0
spawn_chance = 0.7
#Spacing (in chunks) [default: 30]
#Range: 0 ~ 200
spacing = 30
#Minimum Separation (in chunks) [default: 8]
#Range: 0 ~ 200
separation = 8
#Biome Categories the structure can generate in
#Allowed Values: [none, taiga, extreme_hills, jungle, mesa, plains, savanna, icy, theend, beach, forest, ocean, desert, river, swamp, mushroom, nether, underground]
biome_categories = ["plains", "forest", "extreme_hills", "taiga", "desert", "mesa", "savanna", "jungle", "icy", "swamp", "mushroom"]
#Dimensions the structure can NOT generate in
blacklisted_dimensions = ["twilight_forest"]
#Biomes the structure can NOT generate in
blacklisted_biomes = []

Hope that Twilight Forest prohibits the generation of structures. Such a setting does not work.
Want to ban spawning in Twilight , because he will spawn in the air

You need to use "twilightforest", not "twilight_forest". There's no underscore in the dimension ID.

ok~