There still aren't any buttons bound. What did change is that "buttona" is no longer required to be bound.
I feel kinda stupid for not noticing until now but it seems when I save custom controller bindings that they don't get saved by Steam. I tried to create some custom bindings for Beat Saber and when I saves them it says that I am using custom binding in the controller menu. When I try to save custom bindings for tea.exe nothing appears in the controller menu just like when there is nothing bound at all. I also tested this for v.0.3.12 and the bindings are also not getting saved.
Log for #198pre https://pastebin.com/zPZZAF9F