First, you can check the bug by running the following chapter.
1. Pre-apply the font to "Scoreboard".
2. Go to Settings -> Video -> Set GUI scale to -1.

Then, if you compare the image brightness displayed on your screen scoreboard with the original image brightness, the screen with the GUI scale set to -1 will be too bright.

I think this is a problem caused by the difference in screen scale. When set to -1, the image is too bright compared to the original, and when set to 0, it appears in the original image state.

Even if you set the GUI scale to -1 based on Windows, it appears normally when you set it to windowed screen.

GUI scale -1

GUI scale 0