Unable to bubble up 'Uncaught in promise' exception

[tonprince]

Describe the bug

It is not possible to catch an error within an await-then block.

<script>
  import { createBoundary } from './ErrorBoundary.js';
  import FirestackError from './FirestackError.svelte';
  
  let Boundary = createBoundary(FirestackError);
  
  async function getUsers() {
    return ["aaa", "sss"];
  }
</script>
  
<Boundary>
  {#await getUsers() then users}
    {users.error()}
  {/await}
</Boundary>

If I remove the async declaration on the getUsers function, the error is caugth and handled by the boundary error handler.

Reproduction

https://github.com/tonprince/uncaught-in-promise

Logs

Uncaught (in promise) TypeError: ctx[1].error is not a function
    create_then_block +page.svelte:14
    update2 index.mjs:1655
    handle_promise index.mjs:1690
    promise callback*handle_promise index.mjs:1688
    create_default_slot +page.svelte:118
    guarded ErrorBoundary.js:24
    default ErrorBoundary.js:38
    create_slot index.mjs:71
    create_else_block FirestackError.svelte:42
    create_fragment FirestackError.svelte:211
    init index.mjs:2180
    FirestackError FirestackError.svelte:318
    createProxiedComponent svelte-hooks.js:341
    ProxyComponent proxy.js:242
    Proxy<FirestackError> proxy.js:349
    ErrorBoundaryComponent ErrorBoundary.js:52
    create_fragment +page.svelte:162
    init index.mjs:2180
    Page +page.svelte:250
    createComponent svelte-hooks.js:206
    $replace svelte-hooks.js:269
    refreshComponent proxy.js:171
    rerender proxy-adapter-dom.js:77
    reload proxy.js:408
    reload proxy.js:406
    applyHmr hot-api.js:150
    accept client.ts:542
    fetchUpdate client.ts:459
    queueUpdate client.ts:306
    queueUpdate client.ts:306
    handleMessage client.ts:159
    handleMessage client.ts:157
    setupWebSocket client.ts:90
    setupWebSocket client.ts:89
    <anonymous> client.ts:67
+page.svelte:14:13

System Info

System:
    OS: macOS 13.3.1
    CPU: (8) arm64 Apple M2
    Memory: 88.41 MB / 8.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 18.13.0 - ~/.nvm/versions/node/v18.13.0/bin/node
    npm: 8.19.3 - ~/.nvm/versions/node/v18.13.0/bin/npm
  Browsers:
    Chrome: 114.0.5735.90
    Firefox: 113.0.2
    Safari: 16.4
  npmPackages:
    @sveltejs/adapter-auto: ^2.1.0 => 2.1.0 
    @sveltejs/kit: ^1.20.1 => 1.20.1 
    svelte: ^3.59.1 => 3.59.1 
    vite: ^4.3.9 => 4.3.9

Severity

annoyance

Additional Information

No response