Background image for Scenes not showing

Hello agaiin. After I imported my world into Forge I noticed that scenes that were inside the Compedium do not show their default background image in the right panel tab inder SCENES anymore. I tried to reload the asset but it did not work. I tried restarting the server without success.

Any help is appreciated. Thanks
*EDIT: FIXED! I right-clicked and selected Generate Thumbnail Image but it was not working. Reloaded Forge and they finally loaded.