I'm also getting this exact error you mentioned. Every now and then, I just straight up cannot see the enemies unless I use Leech or File Extraction. Not unplayable, but definitely awkward. I'm on Windows 10, playing version 1.5.7. I can send over a save if that'll help.
That's the only bug I've run into. The game is fantastic so far!
Edit: Went ahead and sent an e-mail. Hoping it's an easy fix for ya.