Slider of Terminal scroll bar slider invisible in some profiles

Since macOS 26 or 26.1, in the Terminal application, the slider of the scroll bar is invisible. It exists because you can click where you expect it to be and scroll the window. However, it is invisible or the same color as the background of the scroll bar. To be clear, the scroll bar is present, only its slider is invisible.

More precisely, the slider is invisible in the Terminal application with the following profiles: Basic, Clear Dark, Homebrew, Pro.

However, the slider is visible in the following Terminal profiles: Clear Light, Grass, Man Page, Novel, Ocean, Red Sands, Silver Aerogel, Solid Colors.

See the attached image with two small Terminal windows, side by side. The left one uses the profile Basic and has no slider. The right one uses profile Clear Light and has a slider.

Using System Settings -> Appearance -> Appearance Mode (approximate translation from French menus), selecting Dark mode, the slider is now visible again. Switching back to Clear mode, the slider disappears again.

The slider of the scroll bars is always visible in all other applications. I noticed the problem in the Terminal application only.

How can I restore the slider of the scroll bar in the Terminal application, in all configurations?