Exposing blueprint variables to matinee doesnt work with anim BPs?

[anonymous_user_098d4c49]

I follow the steps outlined in the docs. Animating Characters and Objects in Unreal Engine | Unreal Engine 5.2 Documentation

1. I created a variable in the animation blueprint for the event graph and checked “expose to matinee”.
2. I select the animation blueprint and create a new matinee, add a new group and try to add a bool track but this does not work. No track is generated.

Does this only work for class blueprints?