filter not working (Kotlin MPP)

I have added the plugin to my Kotlin MPP project using this configuration:

ktlint {
    debug = true
    verbose = true
    android = false
    outputToConsole = true
    outputColorName = "RED"
    ignoreFailures = false
    enableExperimentalRules = true
    disabledRules = ["multiline-if-else"]
    reporters {
        reporter "plain"
        reporter "checkstyle"
    }
    filter {
        exclude("**/generated/**")
    }
}

Yet I am getting failures from files under build/generated like this:

Checking <path_to_project>/build/generated/moko/androidMain/src/<classpath>/MR.kt
Resolving .editorconfig files for <path_to_project>/build/generated/moko/androidMain/src/<classpath>/MR.kt file path
<path_to_project>/build/generated/moko/androidMain/src/<classpath>/MR.kt:3:1: Unnecessary import (no-unused-imports)

[xetra11]

@Tapchicoma Sorry after a while I found the FAQ entry for filtering source outside src/main. It’s working with the mentioned workaround now

[PaulWoitaschek]

If someone is looking for this, a possible solution to filter on mpp projects could look like this:

  configure<KtlintExtension> {
    version.set(Dependencies.ktLintVersion)
    filter {
      exclude { tree ->
        val path = tree.file.path
        listOf(".gradle/", "cache/", "build/generated/").any {
          path.contains(it)
        }
      }
    }
  }