Invisible enemies in the Dantooine "Pirates Again" (turret) mission

[LeMerSud]

Product: Star Wars: The Old Republic
Platform:PC
What is your Star Wars: The Old Republic Display Name? (optional) Prefer to stay anonymous
What is the AMD or Nvidia Model Number of your graphics card? AMD Radeon R4 Graphics
What time did this happen? Please include the timezone. Several times
What class were you playing? Powertech / Vanguard
What role were you playing? Damage
How often does the bug occur? Occasionally (10% - 49%)
What happens when the bug occurs? During the Republic daily quest "Pirates Again" on Dantooine, one or more of the enemies is invisible. They appear as a red dot in the mini-map but are not visible on screen and cannot be targeted directly by the weapons. They can and do still damage the player's turret. The quest is unable to proceed until they are somehow killed. The only way to kill them is to try to figure out where they are and try to fire the AOE missiles to their location until it kills them.
What do you expect to see? I expect to see all the enemy NPCs onscreen and be able to target them with the turret's given weapons.
Steps: How can we find the bug ourselves? Play the Pirates Again quest.

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This has happened on a Jedi Knight and Trooper.