Touch actions don't work in the notification

I'm making a custom notification for my music player with KWGT. I already have a great and well-functioning widget, but if I try to do the same thing in the new notification, only the skip to next track button works. I can't skip to previous track, play/pause or open an app. I already tried to set the touch actions to a shortcut I made with another app that pauses, but that didn't work either.

I use a Motorola Moto G6 Plus with the latest updates I can get at the time of writing.

The music player I use is Vanilla Music. As I mentioned before, I already know it works with KWGT, so the problem can't be on their part.

UPDATE: I just tried a few more actions and Kustom actions and the volume control don't work either.