Have you tried this with a general viewport? Ren'Py doesn't pass ATL events to displayables inside containers, so that may be what you're seeing. Otherwise, if it works with a regular viewport and not the controller viewport, if you can make me a short reproducible code section I'll look into debugging it.
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I've got it on my to-do! Unfortunately I just have a lot of things to do 😅 But it's in the issues page of my repo. The example you gave was missing a few things for me to make it run properly, but I was able to reproduce a pretty basic example by popping some ATL on buttons in a controller viewport. I will let you know if I have any updates!