Unexpected character '@' when migrating from Svelte 4 to Svelte 5

I am migrating a a Svelte 4 app to a Svelte 5 app, I used the npx command line

npx sv migrate svelte-5

This resulted in my <slot /> tag in my layout.svelte file on my front page being replaced with {@render children?.()}. This creates a Unexpected character '@' error, which I can't resolve.