Minecraft wiki entry for Missing_textures_and_models, associated text: By creating minecraft:block_marker particles associated with either air, cave air or void air:[2]
/particle minecraft:block_marker minecraft:air
/particle minecraft:block_marker minecraft:cave_air
/particle minecraft:block_marker minecraft:void_air
By creating minecraft:item particles associated with either air or a spyglass:[3][4]
/particle minecraft:item minecraft:air
/particle minecraft:item minecraft:spyglass
By summoning a panda eating a spyglass.[4]
/summon minecraft:panda ~ ~ ~ {HandItems:[{id:"minecraft:spyglass", Count:1b},{}]}