This is interesting but in my experience an avoidable issue if you force the LLM to write extensive E2E tests before writing any code. I also force mine to run performance benchmarks against any new commit before it’s committed.

I have backend bugs that I need to manage myself, usually from unknown-unknowns that I don’t think I can easily avoid, but I never have frontend bugs (since Opus 4.6 anyway).

And if you force the LLM to write extensive E2E tests and performance benchmarks before writing any Svelte code, you're even better off.