It shows as Invalid modifier.

I am also experiencing this, on the latest 1.20.1 version of the mod.

By taking a quick look through the code, seems like that the brass modifier is not registered when Create is installed
https://github.com/wendall911/TCIntegrations/blob/1.20.1/src/main/java/tcintegrations/items/TCIntegrationsModifiers.java#L173

@Insane96 Thanks for pointing this out, was an oversight when I was refactoring for Ad Astra.