[Bug]: [NetworkError]: Failed to execute 'importScripts' on 'WorkerGlobalScope'

[kwonoj]

System Info

System:
OS: macOS 26.1
CPU: (12) arm64 Apple M3 Pro
Memory: 9.12 GB / 36.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 20.19.0 - /Users/ohjoong.kwon/.proto/tools/node/20.19.0/bin/node
Yarn: 4.5.0 - /Users/ohjoong.kwon/.proto/shims/yarn
npm: 10.8.2 - /Users/ohjoong.kwon/.proto/tools/node/20.19.0/bin/npm
Browsers:
Chrome: 142.0.7444.135
Safari: 26.1
npmPackages:
@rspack/cli: ^1.6.3 => 1.6.3
@rspack/core: ^1.6.3 => 1.6.3
@rspack/plugin-react-refresh: ^1.5.3 => 1.5.3

Details

Another 1.5.8 -> 1.6.3 regression. On the prod build with 1.6.3, some of chunks in the worker failed to load with exceptino

[NetworkError]: Failed to execute 'importScripts' on 'WorkerGlobalScope': The script at 'https://xxxxxx.com/assets/app-26cdeb0/app-11141.629fb77f9626c90f.chunk.js' failed to load.

Peeking build output, I could see importScripts transform has slightly changed; but can't tell which part causes the issue

// 1.6.3
__webpack_require__.f.i = function (t, r) {
        e[t] ||
          /^(68(467|938)|(1315|4614|4901)5|50146|74429|8122|96762)$/.test(t) ||
          importScripts(__webpack_require__.p + __webpack_require__.u(t));
      };

// 1.5.8
var e = { 29706: 1 };
      i.f.i = function (t, n) {
        e[t] || importScripts(i.p + i.u(t));
      };

Reproduce link

No response

Reproduce Steps

I'm trying to find out reproducible cases, but it's extremely difficult to create an isolated one.

[kwonoj]

I know it's a long shot, but does output difference rings a bell to any PRs between versions?

[SyMind]

some of chunks in the worker failed to load

Is it possible that it is a network issue?

[kwonoj]

some of chunks in the worker failed to load

Is it possible that it is a network issue?

Doubt so, consistent repro by switching version + local devserver had same.