Create Shape Style disabled in Keynote

How do you create a new shape style in Keynote?

I think in Keynote version 9.2.1 (6529) there is a bug: the button for saving the style is disabled.

To reproduce:

1. Create a new shape
2. Modify the format (e.g., change borders, colour, and shadow)
3. Go to Format > Advanced > Create Shape Style
4. Create Shape Style is disabled

For now, I am dodging the problem by redefining the default shapes.

1. Select shape with new format
2. Right click on an existing shape in shape styles
3. Click Redefine Style from Selection