PsiUtil.resolveClassInClassTypeOnly(type) can not solve expect enum

[kings]

data class OrderRequest(
    val orderType: OrderType,
)

expect enum class OrderType {
  ASC,
  DESC,
}

When parse OrderRequest using PSI API, PsiUtil.resolveClassInClassTypeOnly(type) return null, but when I remove the keywords expect as the following ,it do not return null.

 enum class OrderType {
  ASC,
  DESC,
}

so when I get the PsiType for the field, how I can judge it is enum.

when I use ((PsiClassType) psiType).resolve().isEnum() it return false.