I have a small visual bug to report.
On macOS, I prefer to enable the global setting to always show scrollbars. (System Preferences -> General -> Show scroll bars -> Always)
With this setting enabled and the light theme chosen in GoodTask, the scrollbars have a white background that doesn't look quite right. I would expect the background color of the scrollbar to match the rest of the sidebar.
However, in the dark theme, it has the correct background color.