Working on an update for an older project built on Kilimanjaro and happened to notice that in the Checkout app, the default “customized text” error messages do not encode correctly for the live code while running local renders correctly. Also noticed the issue exists with Elbrus and Vinson. Has anyone else encountered this before? If so, what was the fix?

You could check the handlebars in the template, if HTML is included in the context variable, you should use {{{ as opposed to {{