Directional Particles with initial_speed set to 0 do not work

 

Verification builds:**

1.14.0.3, 1.13.0.x (Windows 10)

Description:

When creating a directional particle effect by setting a specific direction in the emitter shape component and setting the facing_camera_mode to 'direction_z' or another direction, and then setting the particle initial speed to 0, the particle no longer shows up.

Repro Steps:

1. Drop the attached particle file into the particles folder of a resource pack
2. Play the effect in game using the command

   /particle spark:test ~ ~ ~
   

1. The particle won't appear.
2. Go into the file and set 'particle_initial_speed' to 1.
3. The particle effect now works (Make sure to walk around it since it's only visible from one side)

Observed Result:

The particle is not visible with 'particle_initial_speed' set to 0.

Expected Result:**

The particle should be visible just like with an initial speed of 1.

Notes:

A workaround we have found is to set the initial speed to 1 but set the linear drag coefficient to a high number like 100. This will spawn the particle with an initial speed but almost immediately slow down and stop it.