Choosing a selectize value that's not initially loaded (because of maxOptions)

Hi!

Below I'm trying to manipulate a server-side selectize field using shinytest2.
When the to-be-selected value is among the initially loaded choices, this works fine.
But when it's not (because of the maxOptions cap), it doesn't.

Is there a way to make it work?

Thanks!

Toy app:

library(shiny) # v1.7.1

ui <- fluidPage(
    selectizeInput(
        'select', 'Select',
        choices = NULL,
        options = list(maxOptions = 5)
    )
)
server <- function(input, output, session) {
    updateSelectizeInput(
        inputId = 'select',
        choices = 1:10, server = TRUE
    )
}

shinyApp(ui = ui, server = server)

Test:

library(shinytest2) #v0.1.0

app <- AppDriver$new(name = "test")

# works, prints "5"
app$set_inputs(select = 5)
print(app$get_values()$input$select)
app$view()
# doesn't work, prints ""
app$set_inputs(select = 6)
print(app$get_values()$input$select)    

app$stop()

Start by reproducing the toy app with selectizeInput, updateSelectizeInput, and the AppDriver set_inputs/get_values calls, comparing values 5 and 6. Trace how server-side choices interact with the maxOptions setting and verify that selecting a value outside the initial choices is returned as input$select.