After last document closed, design mode can't be opened

Steps to reproduce

• Open some project
• Close all documents with the top toolbar X

Outcome

• After last document is closed, welcome screen is shown and there's the Return to Design button but it doesn't do anything when clicked
• When clicked on the same project that was previously open, it opens to the view shown in the screenshot but such view shouldn't be shown ever. It should always open to design mode.