Discourse theme selection doesn't work after update to 2.9.0beta1

[sam (Sam Saffron)]

Just checking, have you ported to using the official sidebar-theme-toggle?

Sidebar Theme Toggle

Summary Sidebar Theme Toggle adds a theme selector in the sidebar menu’s footer provided there is more than 1 user selectable theme. This selector works with both logged-on users and anonymous users. Be sure to add this to all your user-selectable themes for easy toggling. Repository Link https://github.com/discourse/discourse-sidebar-theme-toggle New to Discourse Themes? Beginner’s guide to using Discourse Themes Install this them…

This is the current supported way of having a theme switcher (like we do on meta)