Custom gradle configurations are not properly picked up

Details

We have a module which generates JOOQ sources and compiles them into java classes.
The module also contains some classes under a/src/main/java which help to produce the JOOQ sources as part of the compileJava task.
So we have something like this in our A module:

val generatedDbDataJar: Configuration by configurations.creating {
    isCanBeConsumed = true
    isCanBeResolved = false
    extendsFrom(configurations["implementation"], configurations["runtimeOnly"])
}

And in our B module we have something like this which consumes it:

    implementation(project(mapOf("path" to ":A")))
    implementation(project(mapOf("path" to ":A", "configuration" to "generatedDbDataJar")))

This setup works absolutely fine if you run ./gradlew build, in Eclipse and in IntelliJ.
However, in Cursor or VSCode the setup above does not work and the produced classes are not recognized in module B and are showing as "missing" classes in the IDE.

It looks to us like this is a bug, unless there's a specific configuration for this case?

Beginne damit, das Setup mit zwei Modulen anhand von Modul A's generatedDbDataJar-Konfiguration und den Projektabhängigkeiten von Modul B nachzustellen, und vergleiche dann ./gradlew build mit dem Import in VS Code oder Cursor. Verfolge, wie die Java extension benutzerdefinierte Gradle-Konfigurationen verarbeitet, und überprüfe, dass generierte Klassen aus A in B aufgelöst werden; erledigt ist die Aufgabe, wenn diese Klassen ohne IDE-Fehler erkannt werden.