[2.x] `@cacheLevel` and `@transient` annotation does not work if local val

steps

project/A.scala

import sbt._
import sbt.util.cacheLevel

class A

object A {
  val f1 = {
    @cacheLevel(Array.empty)
    val b = taskKey[A]("")

    b := new A
  }

  val f2 = {
    @transient
    val b = taskKey[A]("")

    b := new A
  }
}

project/build.properties

sbt.version=2.0.0-RC12

problem

[error] -- Error: /Users/kenji/sbt-2-task-local-val-annotation/project/A.scala:11:4 ----
[error]  11 |    b := new A
[error]     |    ^^^^^^^^^^
[error]     |given evidence sjsonnew.JsonFormat[A] is not found; opt out of caching by annotating the key with @transient, or as foo := Def.uncached(...), or provide a given value
[error]     |---------------------------------------------------------------------------
[error]     |Inline stack trace
[error]     |- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
[error]     |This location contains code that was inlined from A.scala:11
[error]      ---------------------------------------------------------------------------
[error] -- Error: /Users/kenji/sbt-2-task-local-val-annotation/project/A.scala:18:4 ----
[error]  18 |    b := new A
[error]     |    ^^^^^^^^^^
[error]     |given evidence sjsonnew.JsonFormat[A] is not found; opt out of caching by annotating the key with @transient, or as foo := Def.uncached(...), or provide a given value
[error]     |---------------------------------------------------------------------------
[error]     |Inline stack trace
[error]     |- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
[error]     |This location contains code that was inlined from A.scala:18
[error]      ---------------------------------------------------------------------------
[error] two errors found
[error] (Compile / compileIncremental) Compilation failed

expectation

notes