In indented context, the open namespace code fix puts the declaration at wrong indentation level.

It doesn't always affect the code, but when there are type extensions, it breaks it.

module Foo =
  open System

  type DateTime with
    member x.X() = ()

  let a () =
    let t = Task.Factory.StartNew(fun () -> 1) // use the code fix on Task
    ()

Related information

VS2019 16.8