Scala 3.0.2 ClassCastException

Example.scala

object Example {
  import scala.collection.IterableOps
  import scala.language.implicitConversions

  case class Cell[A](value: A)
  object Cell {
    implicit def toSeq[A, It[X] <: IterableOps[X, It, It[X]]](
      cell: Cell[It[A]]
    ): Seq[A] = cell.value.to(Seq)
  }

  implicit class Ops[A, It[X] <: IterableOps[X, It, It[X]]](
    private val it: It[A]
  ) extends AnyVal {
    def cell(): Cell[It[A]] = Cell(it)
  }
}

src.scala

      val l = List(1, 2, 3)
      val ll = l.cell().map(i => i * i)

java.lang.ClassCastException: scala.collection.immutable.$colon$colon cannot be cast to scala.runtime.Nothing$

Workaround:

--- 1.scala     2021-10-05 12:29:58.626057490 +0900
+++ 2.scala     2021-10-05 12:30:12.886196885 +0900
@@ -11,7 +11,7 @@

   implicit class Ops[A, It[X] <: IterableOps[X, It, It[X]]](
     private val it: It[A]
-  ) extends AnyVal {
+  ) {
     def cell(): Cell[It[A]] = Cell(it)
   }
 }

or

--- 1.scala     2021-10-07 19:07:24.129036984 +0900
+++ 3.scala     2021-10-07 19:08:34.149396338 +0900
@@ -10,8 +10,10 @@
   }

   implicit class Ops[A, It[X] <: IterableOps[X, It, It[X]]](
-    private val it: It[A]
+    private val it: A
   ) extends AnyVal {
-    def cell(): Cell[It[A]] = Cell(it)
+    def cell[B, It[X] <: IterableOps[X, It, It[X]]]()(implicit
+      toIt: A <:< It[B]
+    ): Cell[A] = Cell(it)
   }
 }

or

--- 1.scala     2021-10-07 19:07:24.129036984 +0900
+++ 4.scala     2021-10-07 19:09:49.793801654 +0900
@@ -4,8 +4,10 @@

   case class Cell[A](value: A)
   object Cell {
-    implicit def toSeq[A, It[X] <: IterableOps[X, It, It[X]]](
+    implicit def toSeq[A, It[_]](
       cell: Cell[It[A]]
+    )(implicit
+      toIt: It[A] <: IterableOps[A, It, It[A]]
     ): Seq[A] = cell.value.to(Seq)
   }

or replace implicit class with extension

  extension [A, It[X] <: IterableOps[X, It, It[X]]](it: It[A])
    def cell(): Cell[It[A]] = Cell(it)