This is happening on both 6.8.0 and 6.9.0 (Linux Kubuntu and Debian) in the property pane for static text and text fields. On the borders tab, the font for the values in the spinners for all padding settings and the pen width setting has the same color as the background. The only way to see the value is to click in the field and then highlight all the text. How do I change the font color from white to black so I can see the setting?
This shows the "invisible" text:
But it's there when I highlight it: