Unknown compiler exceptions mess up REPL state

[Conduitry]

This has resurfaced, or never went away. I can't figure out what I do to trigger it, but it's not hard. It may have something to do with putting something that causes a compilation error into a child component, even temporarily.

The REPL app gets into a weird state where changes to one component affect multiple components, and the options in the dropdown menu do not always match the current names of the files.

[Conduitry]

It might be triggered by the compiler throwing an exception that the REPL doesn't know how to deal with (e.g., because of a bug in the compiler, rather than an issue we found in the user's component). If I go to https://svelte.technology/repl?version=1.18.0&example=nested-components and type in something that makes the compiler crash (e.g. {{yield}} next to another element, bug), the REPL gets into a bad state and seems to stay that way until I refresh the page.