I don't recall that being reported before...
In the Developer mode version of the Developer's Cut release on PC, there is a cheat window you can try using to teleport to characters.
If you are playing on PC, you can email firstname.lastname@example.org with your save, and I can try the developer build; it has a general fix script that will check and fix character locations, but I don't know if will work for possibly dead NPCs. Mention which version of the game you are using, and the localization, if not English.
The saves should in the folder: C:\Users\<UserName>\AppData\Local\Divinity 2\Savegames
The easiest way to get to that folder would probably be to copy the following into the location bar in Windows Explorer.
To browse there, you may need to set Windows Explorer to show hidden files and folders
(covers Vista through Win 10).