Shared Folder /copying an overwriting modified text file causes error on Ubuntu 16 guest

[haku]

Summary

*copying an overwriting modified text file causes error on Ubuntu 16 guest after overwriting, file contains invalid characters. (can be check with Ubuntu's gedit) and sometimes missing characters. One thing I found weird is, if you open the modified file in the shared folder from guest, it doesn't contain any invalid characters. Invalid character problem only rise when the file is overwritten to the folder in guest env.

*copying an overwritten text file steps can be found under 'How to reproduce the problem'

How to reproduce the problem

1. (host OR guest) create a text file from the host shared folder
2. (guest) copy the shared file to any folder
3. (host) modify the file and save (if you modify the file from guest, it won't happen)
4. (guest) copy the modified file and overwrite it

Attach a (full) log file

see the attached log file

Thank you for the great SW!