It is possible to prompt a ‘AllowInventoryReadAccess’ AvatarEditorService:PromptAllowInventoryReadAccess() request through plugins, and the command bar in Roblox Studio Edit Mode.
No UI is shown the user because it’s likely linked to their LocalPlayer, and CoreGui which is not present.
Expected behavior
Either a prompt should be shown to the user, or it should not be necessary for InventoryReadAccess to be granted by the user when things like AvatarEditorService:GetInventory() is called from the command bar, or a plugin.