If assistant widget shown, then other new opened widgets will not show their content unless some button on the assistant widget got status change. Reproducible: Always Steps to Reproduce: 1.Make sure "Build/Console/Project" widget is not shown. 2.Modify code to let assistant widget pop-up. 3.Click "Build/Console/Project" tab button to let them show up. Actual Results: The new opened "Build/Console/Project" widget show no content. Just empty. If close it, then content show up, then close. Or if move mouse over any button of the assistant button, content show up. Expected Results: Content of "Build/Console/Project" show up after the widget open.
The KDE frameworks version is 5.16, as it's the currently provided version in Debian Sid.
I update plasma from 5.4.3 to 5.5.4, and the bug gone.