Update VU 14.3.0.1;
They got slightly better, almost hunt-able, if you can kill them in 4-7 shots. For a while, and then they start becoming impossible to hit again.
The bug is manifesting in different shapes more often though, before VU 14.3 2of5 was usually going invisible during attack on worst days, while maybe one in 50-70 just went partially invisible, while the hit-box was unaffected.
At VU 14.3 They started out all ok, began bugging after some 15 kills but they did not go invisible they body-parts got randomly spread out over my field of vision, sometimes weirdly stretched, and hit box disappeared.
At VU 14.3.0.1 they start bugging after about 15 kills, and with a new effect where they turn into one-shade-only and their body looks twisted before going invisible. They mostly do not go completely invisible, a few body parts are usually left visible with the hit-box. But it seems it gets worse the longer I hunt them. The hit-boxes gets smaller on the bugged ones, and after about 50 kills the hit-boxes started disappearing totally when they went invisible.