run/markdown-preview/editor: Can successfully make a request to the Renderer failed

[flaky-bot]

Note: #1987 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

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commit: e917df2
buildURL: Build Status, Sponge
status: failed

Test output

Response code 500 (Internal Server Error)
HTTPError: Response code 500 (Internal Server Error)
    at Request. (node_modules/got/dist/source/as-promise/index.js:117:42)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

[flaky-bot]

Looks like this issue is flaky. 😟

I'm going to leave this open and stop commenting.

A human should fix and close this.

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When run at the same commit (e917df2), this test passed in one build (Build Status, Sponge) and failed in another build (Build Status, Sponge).