P: SDK: LrDevelopController.getValue() returns nil for crop settings Select Sky/Subject

LrDevelopController.getValue (key) returns nil for all the crop settings (CropLeft, CropRight, CropTop, CropBottom) immediately after a user clicks Select Subject or Sky.  To reproduce:

1. Save the following script in the Scripts folder.

2. Run the script, which starts a background task calling LrDevelopController.getValue().

3. Edit a photo in Develop, open the Masking tool, and click Select Sky.

4. Observe this message displayed:

Tested on LR 11.2 / Mac OS 11.6.2.

local LrTasks = import "LrTasks"

local catalog = import "LrApplication".activeCatalog ()
local getCurrentModuleName = import "LrApplicationView".getCurrentModuleName
local getValue = import "LrDevelopController".getValue
local showBezel = import "LrDialogs".showBezel

LrTasks.startAsyncTask (function ()
    while true do
        local photo = catalog:getTargetPhoto ()
        if photo ~= nil and getCurrentModuleName () == "develop" then
            local CropLeft, CropRight, CropTop, CropBottom = 
                getValue ("CropLeft"), getValue ("CropRight"),
                getValue ("CropTop"), getValue ("CropBottom")
            if CropLeft == nil then 
                showBezel (string.format (
                    "CropLeft = %s\nCropRight = %s\nCropTop = %s\n" ..
                    "CropBottom = %s\n", CropLeft, CropRight, CropTop, 
                    CropBottom), 10)
                end
            end
        LrTasks.sleep (0.2)
        end
    end)