Not supported type in refinement warning from scaladoc

[SimY4]

Compiler version

3.4.1

Minimized code

import java.io.IOException
import scala.annotation.experimental

trait T[F[_]]:
  def doSmth: F[Unit]

@experimental
class C extends T[[X] =>> CanThrow[IOException] ?=> X]:
  def doSmth: CanThrow[IOException] ?=> Unit = ()

Output

scalac compiles with no warnings. scaladoc shows this warning:

docs/scaladoc/scripts/searchData.js:253:{"l":"C.html#","e":false,"i":"","n":"ProcessingEnv","t":"ProcessingEnv(filer: Filer) extends T[[X] =>> Unsupported[Not supported type in refinement ContextualMethodType(List(x$1), List(AnnotatedType(AppliedType(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class <root>)),object scala),CanThrow),List(TypeRef(TermRef(ThisType(TypeRef(NoPrefix,module class java)),object io),IOException))),ConcreteAnnotation(Apply(Select(New(TypeTree[TypeRef(ThisType(TypeRef(NoPrefix,module class internal)),class ErasedParam)]),<init>),List())))), TypeParamRef(X))]]","d":"C","k":"class","x":""},