[BUG] Running foundry with prefix gives 404 on some resources

[Rohendor]

Hi everyone,
I have a Foundry instance running behind a domain with a URL prefix, such as http://domain.com/fabula/join. Most resources are loaded correctly, as the server appends the fabula prefix to resources path. However, some resources fail to load as the prefix is not inserted in the URL call. This seems to happen when loading resources in the "/systems/projectfu/styles/*" folder by the script "/fabula/systems/projectfu/styles/css/projectfu.css" (Which itself is loaded correclty)
The files themselves exist in the filesystem, and if the prefix (fabula) is manually added to the resource URL, they are accessible. For example, changing the not working URL: "domain.com/systems/projectfu/styles/static/compendium/ui/coins_5.png" to be "domain.com/fabula/systems/projectfu/styles/static/compendium/ui/coins_5.png" allows the file to be downloaded.

To Reproduce
Expose a foundry instance running the Fabula-Ultima system using a prefix

Expected behavior
It should load the resources correctly by taking into account the prefix

Thank you