When Reactive Healing procs while you are repairing a generator, your Hyperfocus stacks are reset to zero. I am not sure if this is intentional, but the survivor animation shows that you don't let go of the generator so it doesn't make sense that the stacks will be removed.
Personally I find that this change is much needed as I keep seeing survivors using map offerings, be it SWF or solo. The supply of map offerings always overwhelms sacrificial wards, since there are 4 survivors and only 1 killer. If it's not possible to change the appearance rate for just 1 Rare (Green) item, then I think…
Freddy for example.
