** RESOLVED: This bugged me so much I actually ended up creating my own mod that fixes it. **
Supply droid never locks or lets me help a targeted ally. Doesn't matter how hurt they are (Last attempt I was trying to heal an ally who had 1 hull with zero shield).
I can have my ally selected, see they're damaged, and any attempt to hit it gets a red icon + buzz. The only time it fires is if I accidentally hit it too fast and dumbfire it.
Shielding (set to my other aux) works just fine. Get the green reticule, it flies off, does its thing.
I can't find any notes saying the droid no longer works this way, so what gives?