1. Create a Land_CratesWooden_F (Crates (Wooden)) in the editor
2. Paste the following code into its init field:

mfire = "#particlesource" createVehicleLocal position this;
mfire attachTo [this,[0,0,0]];
mfire setParticleParams [["\A3\data_f\ParticleEffects\Universal\Universal", 16, 10, 32,1], "", "Billboard", 1, 1.5, [0, 0, 3], [0, 0, 1], 0, 1.275, 1, 0.066, [1.75,.2], [[1, 1, 1, .8],[1, 1, 1, 0]], [1], 1, 0, "", "", this,0,false,-1,[[1, 1, 1, .8],[1, 1, 1, 0]]];
mfire setDropInterval .08;

3. Start the mission, observe the terrible-looking fire.
4. Paste the same code in a soldier's init field, start the mission and see the good-looking fire.
5. Remove the attachTo line from the crate's code, start the mission, and see good-looking fire.

Everything tested without mods loaded.