In singleplayer, when a villager dies, its server-side death is logged and the client-side death is also logged afterwards. The client-side death does not have the exact coordinates of where the villager died, and it also always uses the death message "Villager died", because the client only knows that it died, not how it died.

How to reproduce:

1. In the launcher, go to the settings and enable "Open output log when Minecraft: Java Edition starts".
2. Launch any version (to be safe, the version should be fairly modern, as I don't know when villager deaths started getting logged).
3. Enter a singleplayer world.
4. Kill a villager somehow.
5. Look at the log.