Studio Code Server: Preview of jpg not working

I have Studio Code Server v5.17.2 installed and use it a lot, both for coding my yaml-files as well as for browsing my HA share.

In the past, I was able to (pre)view the jpg-files in my www-folder with Studio Code Server. When selecting a jpg, a separate tab opened which showed the jpg. However, just a blank tab opens without any preview (only shows the jpg’s filename on top of the tab).

How can I activate the preview function again? Many thanks for your help!