Doc.SelectDynOptional loses the selection

[giuliohome]

As discussed with @amieres in gitter channel and as shown also by his mock-up repro, Doc.SelectDynOptional loses the selection after updating the options of a dropdown, unless the selected value is in the first position of the list.
My basic mock-up is shown below

namespace Samples

open WebSharper
open WebSharper.JavaScript
open WebSharper.UI
open WebSharper.UI.Html
open WebSharper.UI.Client
open WebSharper.UI.Notation

[<JavaScript>]
module HelloWorld =
    
    let getUsers() = async {
            do! Async.Sleep 100
            return Result.Ok ["you"; "me"; ]
        }

    let Main =
        let lineAssignedTo = "me"
        let assignedTo = Option.ofObj lineAssignedTo 
        let assignedVar = Var.Create<string option> assignedTo
        let users =  
            assignedTo 
            |> Option.fold (fun _ x -> [x]) []
            |> Var.Create<string list>
        async {
            match! getUsers() with
            | Result.Error error -> Console.Log error
            | Result.Ok dbusers -> 
                users.Set dbusers
        } |> Async.StartImmediate
        div [] [
            Doc.SelectDynOptional [] 
                 "No one assigned" id users.View assignedVar
        ]
        |> Doc.RunById "main"

The problem is that, after 100 ms, the command users.Set dbusers updates the users.View of the dropdown as expected, but the effect of the assignedVar is lost.

[giuliohome]

I need to open this in W# UI

Opened here