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 support@larian.com 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.
%LocalAppData%\Divinity 2\Savegames
To browse there, you may need to
set Windows Explorer to show hidden files and folders (covers Vista through Win 10).