Cannot get autocomplete results to show when using self functions

The autocomplete menu does not show when using : to call functions from a module even when the functions exist & require self.

Module:

local Solar = {}

function Solar:GetService(Service: "CommandService" | "PluginService" | "ThemeService" | "AutocompleteService" | "NotificationService")
--// code here
end

return Solar

Autocompletion for .


Autocompletion for :

However it still works if you type it out manually:

And when you use . it shows the self argument:

I’ve tried restarting studio, switching scripts, using other modules, etc and it still does not show autocomplete results when using : to call a function.