Turn signal stalk isn't working

This is just one of the many problems on my stang, but my auto cancel thing on the turn stalk doesn’t work when I turn left. It’s not really that big of a deal, and it’s something I’ve adapted to just cancel on my own, but is there a way to fix this and make it start auto canceling again?

Would it be caused by an internal part, the whole stalk assembly, or something electronic?