Changes made in a model are seen in another project's model

Steps to reproduce:

• Open DS and create general empty project
• Open Model Editor view
• Add few columns, rows and data to "book" model
• Close the project (File -> Close all projects and editors)
• Create another project
• -> In Model Editor view, "book" model has the extra rows&columns&data that was added in previous project. Would expect it to only have the default content.
• Click "Add row" or "Add column" button
• -> All data inside the table disappears