sentry-javascript-bundler-plugins: Sourcemaps not available after successful Sentry vite-plugin upload

Environment

What version are you running? Etc.

$  npm version
{
  npm: '9.6.7',
  node: '20.3.1',
  ...
}

$ npm ls -D vite @sentry/vite-plugin rollup
├── @sentry/vite-plugin@2.5.0
├─┬ @vitejs/plugin-react@4.0.3
│ └── vite@4.4.7 deduped
├─┬ vite-plugin-eslint@1.8.1
│ └── vite@4.4.7 deduped
├── vite@4.4.7
├── rollup@3.26.3

vite.config.js:

import {defineConfig} from 'vite';
import react from '@vitejs/plugin-react';
import browserslistToEsbuild from 'browserslist-to-esbuild';
import { sentryVitePlugin } from "@sentry/vite-plugin";

export default defineConfig(() => {
    return {
        base: '/myproject/',
        plugins: [
            react(),
            sentryVitePlugin({
                authToken: process.env.SENTRY_AUTH_TOKEN,
                org: "myorg",
                project: "my-project",
                url: "https://sentry-selfhosted.example.org/",
                debug: true,
                release: {
                    name: "my-test-release",
                    setCommits: {
                        auto: true,
                    }
                },
            }),
        ],
        build: {
            outDir: 'build',
            sourcemap: true,
            target: browserslistToEsbuild(),
        },
    };
});

Steps to Reproduce

I just ran an npm run build, which does a vite build

Expected Result

A release is created, commits are added, and bundled sources and sourcemaps from the build are uploaded and associated with the release.

Actual Result

The release was created, as were the commits.

Locally, the source bundle files and sourcemaps were identified and - according to the logs - successfully uploaded.

In the UI however, there were no artifacts. Looking at the release page for the newly created release, it claimed to have some artifacts:

Clicking on the link, or navigating to the project’s sourcemaps page however, the sourcemaps archive for the release was present, but empty (artifacts -1):

Relevant npm build logs:

[sentry-vite-plugin] Debug: No `sourcemaps.assets` option provided, falling back to uploading detected build artifacts.
build/index.html                     3.15 kB │ gzip:   1.43 kB
build/assets/index-5fa0a054.css    263.86 kB │ gzip:  36.77 kB
build/assets/index-062d6867.js   1,297.09 kB │ gzip: 451.66 kB │ map: 6,511.39 kB

(!) Some chunks are larger than 500 kBs after minification. Consider:
- Using dynamic import() to code-split the application
- Use build.rollupOptions.output.manualChunks to improve chunking: https://rollupjs.org/configuration-options/#output-manualchunks
- Adjust chunk size limit for this warning via build.chunkSizeWarningLimit.

> Found 2 files
> Analyzing 2 sources
> Analyzing completed in 0.009s
> Adding source map references
> Bundling completed in 0.239s
> Bundled 2 files for upload
> Bundle ID: e106fb55-4dc7-5583-b0e2-87d0983ab202
> Optimizing completed in 0.012s
> Uploading completed in 0.542s
> Uploaded files to Sentry
> Processing completed in 0.163s
> File upload complete (processing pending on server)
> Organization: dpa
> Project: nextar-frontend
> Release: 00002-8b0576e
> Dist: None
> Upload type: artifact bundle

Source Map Upload Report
  Minified Scripts
    ~/3d13895f-7dfc-4882-9a3d-6a322b0f3d6f-0.js (sourcemap at index-062d6867.js.map, debug id 3d13895f-7dfc-4882-9a3d-6a322b0f3d6f)
  Source Maps
    ~/3d13895f-7dfc-4882-9a3d-6a322b0f3d6f-0.js.map (debug id 3d13895f-7dfc-4882-9a3d-6a322b0f3d6f)
[sentry-vite-plugin] Info: Successfully uploaded source maps to Sentry