nested pattern can't used named params when outer does not

[bishabosha]

Compiler version

3.7.0

Minimized code

case class Account(b: Balance, data: List[AnyRef])
case class Balance(acc: String, balance: AnyRef) // simplified
def reportUncategorised(acc: Account): Unit =
  val Account(Balance(acc = kind), data) = acc

Output

-- Error: ----------------------------------------------------------------------
4 |  val Account(Balance(acc = kind), data) = acc
  |                      ^
  |                   Illegal combination of named and unnamed tuple elements
1 error found

Expectation

I thought this error only applied within the same constructor - i.e. Balance, it should not care that Account uses positional patterns surely.