Svelte Derived Chain Problem

This repo demonstrates unexpected behavior from chaining a derived class property. In the parent context we have a SvelteSet property and a $derived property. We pass these into the child context, which watches both of these.

As the parent context's set is updated, all references OTHER THAN the derived one update as well.

Reproduction

Run this app with pnpm dev (after pnpm i), open http://localhost:5173, and click the "Increment" button.

Expected result

All 4 lists update.

Actual result

Both parent sets update, but only the direct set watcher updates on the child context. The watcher for the parent's derived set is not.