Smart placement breaks Durable Object RPC

If you are getting cryptic error like

The RPC receiver does not implement the method ...

trying to call your Durable Object’s method via RPC setup, disable smart placement of the worker.

I lost a day of work because of this. Multiple people on Discord too.

Would be nice to have some kind of reaction from Cloudflare, because it’s our company’s first experience with Cloudflare and it doesn’t look good that you might be blocked by whatever trouble without any help from Cloudflare.