Steps to reproduce:
1. Add a TouchGrid to project (2.3.x)
2. Add editable plugin (all columns are automatically set to 'editable: true')
3. Save
4. Close
5. Open project ("editable" is missing from grid columns)
6. Save (app/metadata files are changed)

Also, once the plugin is added, it seems to get stuck & can't be moved before or after any columns in the project inspector.

FWIW, I get this error when I try to upload the project:
01-13 01.png