[2.0 / next] Regression (#4456): an Errored mounted with an error stays on its fallback after a keyed projection's answer lands #4517

/**
 * @jsxImportSource @solidjs/web
 * @vitest-environment jsdom
 */
import { test } from "vitest";
import { Show, Errored, Loading, For, createSignal, createMemo, createProjection, flush } from "solid-js";
import { render } from "../src/index.js";
const tick = async () => { for (let i = 0; i < 4; i++) { await new Promise(r => setTimeout(r, 0)); flush(); } };
for (const keyed of [true, false])
test(`an answer replaces the error a boundary was born with (keyed=${keyed})`, async () => {
  const asks: { key: string; res: (v: any) => void }[] = [];
  const ask = (key: string) => new Promise<any>(res => asks.push({ key, res }));
  const land = async (key: string, v: any) => { for (const a of asks.filter(a => a.key === key)) { asks.splice(asks.indexOf(a), 1); a.res(v); } await tick(); };
  const container = document.body.appendChild(document.createElement("div"));
  const frames: string[] = []; const snap = (l: string) => frames.push(`${l}: ${container.textContent}`);
  let setQ!: (q: string) => void;
  render(() => {
    const [q, sq] = createSignal(""); setQ = sq;
    const src = createMemo(() => { const s = q(); if (s === "") return []; if (s.length < 2) throw new Error("too short"); return ask(`search:${s}`); });
    const results: () => any[] = keyed ? (() => { const p = createProjection(() => src() as any, [] as any, { key: "id" } as any); return () => p as any; })() : (src as any);
    return <Show when={q() !== ""}>
      <Errored fallback={(e: any) => <p>{e().message}</p>}>
        <Loading fallback={<p>loading</p>}>
          <For each={results()}>{(r: any) => <i>{r.name}</i>}</For>
        </Loading>
      </Errored>
    </Show>;
  }, container);
  await tick(); snap("mount");
  setQ("a"); await tick(); snap("query a");
  setQ("ap"); await tick(); snap("query ap");
  await land("search:ap", [{ id: 1, name: "apple" }, { id: 2, name: "apricot" }]); snap("answer");
  console.log(`keyed=${keyed}\n` + frames.join("\n"));
  container.remove();
});