Stalag Terrors, Feign Death, and Line of Sight
 

In my experience, since the nerf to sneak, the effective way to pull is by using Line of Sight to break mobs up.

When I stand up from FD, if a mob is far enough LoS around a corner, they won't re-aggro even if they haven't pathed back to spawn point.

This has worked throughout crystal caverns and other zones.

However, the Stalag Terrors will re-aggro upon stand, even if you are out of Line of Sight.

I have tested this by going many winds up the geo halls and trying to drop aggro, but the stalag terrors just keep coming back.

Is there anything I can do to test this and report the bug in a more useful manner?

Check the level of mobs you are trying to FD against. Once they go above 35 they tend to remember, below that FD is almost guaranteed aggro wipe.