Unresolved symbol when pickling triggered by inlining def that uses a type variable in summonFrom

[rcano]

minimized code

object Boom {
  import scala.compiletime._
  trait Fail[A <: Int, B <: Int]

  erased inline given fail[X <: Int, Y <: Int]: Fail[X, Y] = {
     scala.compiletime.summonFrom {
       case t: Fail[X, y] if constValue[y] < constValue[Y] => ???
    }
  }

  val a: Int = 1
  given ev1: Fail[a.type, 2] = null

  summon[Fail[a.type, 3]]
}

assertion failed: unresolved symbols: type y(line 6) when pickling /testdotty/src/main/scala/boom.scala

java.lang.AssertionError: assertion failed: unresolved symbols: type y(line 6) when pickling /testdotty/src/main/scala/boom.scala
dotty.DottyPredef$.assertFail(DottyPredef.scala:17)
dotty.tools.dotc.core.tasty.TreePickler.pickle(TreePickler.scala:704)
dotty.tools.dotc.transform.Pickler.run$$anonfun$10$$anonfun$8(Pickler.scala:63)
dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
scala.collection.immutable.List.foreach(List.scala:305)
dotty.tools.dotc.transform.Pickler.run$$anonfun$2(Pickler.scala:87)
dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
scala.collection.immutable.List.foreach(List.scala:305)
dotty.tools.dotc.transform.Pickler.run(Pickler.scala:87)
dotty.tools.dotc.core.Phases$Phase.runOn$$anonfun$1(Phases.scala:315)
scala.collection.immutable.List.map(List.scala:223)
dotty.tools.dotc.core.Phases$Phase.runOn(Phases.scala:316)
dotty.tools.dotc.transform.Pickler.runOn(Pickler.scala:91)
dotty.tools.dotc.Run.runPhases$4$$anonfun$4(Run.scala:161)
dotty.runtime.function.JProcedure1.apply(JProcedure1.java:15)
dotty.runtime.function.JProcedure1.apply(JProcedure1.java:10)
scala.collection.ArrayOps$.foreach$extension(ArrayOps.scala:1323)
dotty.tools.dotc.Run.runPhases$5(Run.scala:171)
dotty.tools.dotc.Run.compileUnits$$anonfun$1(Run.scala:179)
dotty.runtime.function.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
dotty.tools.dotc.util.Stats$.maybeMonitored(Stats.scala:65)
dotty.tools.dotc.Run.compileUnits(Run.scala:186)
dotty.tools.dotc.Run.compileSources(Run.scala:123)
dotty.tools.dotc.Run.compile(Run.scala:106)
dotty.tools.dotc.Driver.doCompile(Driver.scala:36)
dotty.tools.dotc.Driver.process(Driver.scala:189)
dotty.tools.dotc.Main.process(Main.scala)