Switch to Design Mode button can sometimes lead to Welcome page

Steps to reproduce:

• Create/Open a project
• Open Projects view
• Double click project_name.qmlproject file to open it
• Click "Switch do Design Mode" button in top toolbar
• -> Welcome page is opened instead of Design Mode
• -> not sure how to navigate back to the project. Clicking Switch to Design Mode again does not do that
• -> Finally was able to open Design Mode again by going first to "Recent Projects" tab -> Click the project tile -> Click main ui.qml file in "Open Documents