Restarted my editor and am now being spammed with this error:
Trying to read more from a file than the file size.
'D:/SteamLibrary/steamapps/common/Divinity Original Sin 2/Data/Mods/MyModName/Story/story.div.osi'
Category: Code
Count: 999
Timestamp: 02-02-2018 23:52:25:325
Function: ls::FileReader::Read
Location: CoreLib\FileReader.cpp (366)
Deleting story.div.osi and regenerating definitions/build seems to have solved the problem for now.