java8 type annotations missing in bytecode

[scf37]

Given following code:

import javax.validation.valueextraction.ExtractedValue
import javax.validation.valueextraction.ValueExtractor
import javax.validation.valueextraction.ValueExtractor.ValueReceiver

class OptionValueExtractor extends ValueExtractor[Option[_@ExtractedValue]] {

  override def extractValues(originalValue: Option[_], receiver: ValueReceiver) = {
    receiver.value( null, originalValue.orNull)
  }
}

I expect @ExtractedValue annotation to be present in bytecode.
But it seems it is not there.

another example:

import javax.validation.constraints.NotNull
case class OptionData(
  option: Option[String @NotNull(message = "NotNull on Option value")]
)

Annotation is missing from bytecode as well

Scala 2.12.7