As weird as this may sound KubeJS is unable to locate the config 'brewinandchewin-common', causing all of my custom recipes for other mods to not function, but only when launched via a server. There are no noticeable issues when in singleplayer. Screenshot of the error message and the server log below:

mclo.gs/qPhDsO4

This should be fixed as soon as I update my config lib to a later version. If not, I'll look at a different point to move it to.