item display spawn egg

so my command is: /give @p minecraft:allay_spawn_egg[minecraft:entity_data={id:"minecraft:item_display",nbt:{item: {count: 1, id: "minecraft:deepslate_tiles"}, transformation: {left_rotation: [0.0f, 0.0f, 0.0f, 1.0f], right_rotation: [0.0f, 0.0f, 0.0f, 1.0f], scale: [1.0f, 1.0f, 0.5f], translation: [0.0f, 0.0f, 0.0f]}}}] and it spawn and gives me the egg but the textures dont appear. pls help someone 😄