private keyword in type not inserted correct in signature

[nojaf]

When generating a signature file the result is somewhat unexpected.

Repro steps

module Foo

type P<'a> = class end

[<RequireQualifiedAccess>]
[<CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
module R =     
    type private  'a P = unit -> 'a

leads to

module Foo

type P<'a> =
  class end

[<RequireQualifiedAccess; CompilationRepresentation (enum<CompilationRepresentationFlags> (4))>]
module R =
  
  type 'a private P = unit -> 'a

Expected behaviour

It should be type private 'a P = unit -> 'a

Actual behaviour

private should not be between 'a and P.

Related information

FCS: FSharpCheckFileResults.GenerateSignature