Bad owner of anonymous function after expandSAMs

## Compiler version

3.6.4

## Minimized code

```Scala
object Bug:

  def m0(f: PartialFunction[Char, Unit]): Unit = ()

  def m1(): Unit =
    m0: x =>
      "abc".filter(_ == x) match
        case _ => ()

```

## Output (click arrow to expand)

See bug.log (or the more readable bug-nocolor.log) in attached zip file.

[files.zip](https://github.com/user-attachments/files/19924824/files.zip)


