Cannot overrwrite var setters in sub-class of sub-class - "error overriding variable … cannot override a mutable variable"

[Sciss]

reproduction steps

using Scala 3.0.2,

trait Foo

trait Top:
  var foo: Foo

trait Middle extends Top:
  def foo: Foo = ???
  def foo_=(value: Foo): Unit = ???

class Bottom extends Middle:
  // error overriding variable foo in trait Top of type Foo;
  // method foo_= of type (value: Foo): Unit cannot override a mutable variable
  override def foo_=(value: Foo): Unit =
    super.foo_=(value)
    println("Helo")

If I rewrite Top as

trait Top:
  def foo: Foo
  def foo_=(value: Foo): Unit

"it works"

problem

I think it should always be possible to override getters and setters for a var.

[odersky]

I could not reproduce. It works for me when I compile with nightly.

[som-snytt]

Duplicates #13019 which I contributed because of the linked scala 2 ticket (which it also duplicates).