Unable to document enums

[ChrisCanCompute]

Using:

    <TargetFrameworks>net6.0</TargetFrameworks>

I've got the following F# code:

/// A Foo enum
type Foo =
    /// The bar case
    | Bar = 0

I would expect this to pass the documentation check.

Instead I get:

The following 1 member(s) are only in 'Test.xml':
  + F:Test.Foo.Bar

The following 2 member(s) are only in 'Test.dll':
  - P:Test.Foo.Bar
  - F:Test.Foo.value__

So I checked the readme, and tried to do:

/// A Foo enum
[<Undocumented>]
type Foo =
    /// The bar case
    | Bar = 0

But that attribute doesn't exist :'(