After a long time this issue has finally been resolved. Now you don't disable the Smeltery-Module in Tinkers' config, but remove the recipes of the smeltery from my config.
Also I moved the "requireRawStamps" to its own section.
Developer information
Projects on Modrinth are automatically available through a Maven repository for use with JVM build tools such as Gradle.
maven { name = "Modrinth"; url = "https://api.modrinth.com/maven" }