I just checked, and healing process added to the city health. It was 4, I selected the process, it when to 9 (healing adds 5), I selected a building instead, went back to 4, repeated.
There is one oddity, when changing selection from healing to creation, the health stayed up until another turn, will have to check why, but health was working.
There are other things that effect health and how it is calculated, so it is possible something else is counteracting it.
There is one oddity, when changing selection from healing to creation, the health stayed up until another turn, will have to check why, but health was working.
There are other things that effect health and how it is calculated, so it is possible something else is counteracting it.