The text editor shows the right design of the choosen fonts, but in the preview windows (and even in the rendered video file) there is only a normal (Arial?) font.

Other programs (e. g. LibreOffice) work well with this fonts.

It happens randomly. To fix it, I have to install the font manually (double-click on ttf) and then I have to restart Vegas Pro and it will work for some time (days). The problem is the same with some other fonts...

Windows 11
Radeon RX6600
32 GB RAM
AMD Ryzen 5600X
Vegas 20.0.214