Ok,so actually I was wrong again. Sorry it took so long to respond but I was in raid.
I tried this with Slim Unit Frames, PotatoUI, and the default Carbine unit frames. Lockdown will target with the reticle correctly, until you zone or die. Then it will still show the red or yellow "aura" around the enemy the reticle is on, but the unit frame of the target will not be displayed. Reloadui fixes the problem temporarily.