he would've worked on patients close to death, to ease their last moment with company, conversation, song, treatment. NOT ANYMORE- he is not allowed to treat patients in the hospital anymore. They say it's for his safety, but he knows something strange is happening, the dead are buried in his graveyard after all.
he doesnt see what happens in the hospital: stimulation, treatment and experimentation of agonizing patients and dead bodies.
however, he knows that are more people dying than being buried. and he has no idea what's going on. He suspects someone is smuggling dead bodies to necromancers.... why anyone would want dead bodies otherwise?
The other option is that there is a new crematory system to avoid the spreading of the plague.