Pikled expression failing to Ycheck

[nicolasstucki]

def foo: Expr[Option[String]] = '(None)

fails Ycheck with

checking xyz.scala after phase reifyQuotes
exception while typing def foo: quoted.Expr[Option[String]] = 
  scala.runtime.quoted.Unpickler.unpickleExpr[None](
    scala.collection.immutable.Nil.::[String](
      
        "\\¡«\037\0212\0200\00\00\00\00\00\00\00\00\00\00\00\00\03â\06°\0223\01\0204ASTs\01\0204None\01\0205scala\0200\0204s\02016\0202"
      
    )
  , scala.collection.immutable.Nil) of class class dotty.tools.dotc.ast.Trees$DefDef # 673

Where unpickleExpr[None] returns an Expr[None]. Probably the T in Expr should be covariant.