Custom Tailwind colours and the tailwind class tree

I’ve created a custom colour in the design panel.


Once it’s been save the colour appears in the tailwind.config.js file and I can use it as any other Tailwind css property in my html.

However If I choose to edit an element’s properties using the new Tailwind class tree (a really nice addition incidentally) said new colour does not appear as one of the options. It seems only to display the standard Tailwind options.

Have I missed a configuration setting somewhere of does the class tree for Tailwind not pickup custom classes.