Affects Version/s: Minecraft 18w05a
Fix Version/s: Minecraft 18w19a
It appears that /particle spawns particles in all dimensions, even when executing 'at' an entity, or using the 'in [dimension]' argument.
- Put in a repeating command block: execute in overworld run particle flame ~ ~1 ~ Make sure it is in the spawn chunks so it stays loaded.
- Run the command: execute in the_nether run tp @s to get to the nether.
- Notice the particles are appearing where they are being spawned in the overworld.