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I think this is purely a Kotlin plugin issue. try using

kotlin {
  target {
    compilations.all {
      kotlinOptions {
        jvmTarget = "11"

and watch https://youtrack.jetbrains.com/issue/KT-50115

It’s usually a false positive due to a bug in Koltin. See workaround here: https://github.com/gradle/gradle/issues/18935#issuecomment-974251717