The villager career ID is not sync'ed with the client. Instead of using getDisplayName() for villagers use getProfessionForge() and attempt to translate the profession.

Bug reported by Rakarukri:
https://minecraft.curseforge.com/projects/torohealth-damage-indicators?comment=44

I could detect if this mod is installed on the server too, and if so figure out a way to send down the missing information. I would get potion effects that way too, which I would like to see. I would like to keep this mod where it doesn't require a server side component though.

Our intent is to keep this client-side only. This will just have to be something we live with, unfortunately.