Intermittent rendering of Shoelace web components in Hybrids.js

I'm trying to demonstrate a simple case of rendering a Shoelace web component in [login to view URL]; however, my Shoelace web component <sl-alert> renders intermittently. I get the following error message on localhost when my Shoelace web component doesn't render: [login to view URL] Uncaught Error: Missing <sl-alert> element definition in <my-app> at updateTemplateInstance ([login to view URL]) at createTemplate ([login to view URL]) at flush ([login to view URL]) at observe ([login to view URL]) at [login to view URL] at [login to view URL] at [login to view URL] (<anonymous>) at execute ([login to view URL])``` You can try out the code at this github repository: [login to view URL]