Harvesters and Tanks with rocket pods are gaining ultra-accuracy and fire all rockets at the exact same spot. I can semi-reliably say that this might not be completely random and might have something to do with the enemy losing sight of the player at the moment or shortly before firing, I have also run into issues of tanks and harvesters either firing not enough rockets for a salvo (only 2-3) or simply not stopping to fire, resulting in insane barrages of 100+ rockets. While this is epic, it kills framerate, and sometimes the player 
I’ve seen it as well and it happens when harv/tank looses sight of you. They then fire at the last spot where you were sighted. It makes things more realistic.
That started with the Resistance update. Before the update, tank rocket salvo consisted of 10 rockets. After the update, only 2 rockets. Posed it in here as well: Regarding inaccessible houses in map revamps - #41 by Aesyle
Well, I think the rockets should at least maintain their usual spread. They actually do when the player is far away, on my character with -60% visibility I saw tanks and harvs firing on my last known position which was around 50 meters from where I stood they did their normal firing, but the hyper-accuracy only occurs when it happens immediately after losing sight combat apparently. That issue by itself already occured pre-resistance, but the two-shot salvoes are new, yeah.
I have reported this bug also in Discord server. It cannot be WAI. One of those stream of rocket will kill you in any difficulty level, even with 20% explosive resistances on clothing. I have died so many times to this stream of rockets.
And it cannot be they lost sight to player, happens also when you just run open in fields.