This is about https://chromium-review.googlesource.com/c/499488/ (that I'm going to submit soon, so its state will be different).

It looks like a recent regression. When I click "Submit to CQ" or "CQ Dry run" buttons, the page flickers, but nothing else happens.

In more detail, I see "Submit to CQ" label changing state to disabled and caption to "CQ Running...". A second later the page reloads, and there's no "Commit-Queue" label set (and the button is back to "Submit to CQ" caption).

Chrome DevTools tell me that a click on "Submit to CQ" button results in HTTP POST to /review endpoint with following body:

{drafts: "KEEP", labels: {}, message: "", reviewers: []}

(which seems like a noop?..)

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Same happens with "CQ Dry Run" button.

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As a workaround I click "Reply", then pick Commit-Queue "+2" in the dialog, and the "Send". It works.

(It results in POST to /review with following body:
{drafts: "PUBLISH_ALL_REVISIONS", labels: {Commit-Queue: 2}, message: "", reviewers: []}
)