Parts wrangling Trial bug

[Midnight]

I can't finish this Trial due to it not counting me destroying thne processor units of tramplers, any of you know if there is a way around this bug, even using the spear is not working.

[EL TORO]

They must be tied down. Use the rope caster and make sure they are tied down when you destroy it. Sometimes the last hit happens when they are already free.

[Kasei Vallis]

I found the easiest method is to hit the processor twice with the hardpoint arrows on the Shadow hunter bow, then tie them down for the 3rd/4th shot.

[NotReallyMyName]

Use carja rope caster, and get the double, or better, triple shot skill. Before tying down the bisons, notch additional tearblast arrows on your sharpshooter bow, and once they're down, launch them at their underbellies, it will be a blast.
Also don't forget to use tear coils on the sharpshooter bow.