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Root cause: v8.21 added a top-level `function jitterDelay()` helper.
In some Tampermonkey/cache scenarios the helper is undefined inside
the `handleCaptchaDirectInPage` async closure, throwing
`ReferenceError: jitterDelay is not defined`. The catch block then
resets `captchaSent = false` and `lastCaptchaText = ''`, so the
`setInterval(checkCaptchaPrompt, 50)` loop resends the same captcha
to the backend every 50ms ("dead loop sending captcha").
Fix: inline the ±20% jitter math at both call sites
(line 1814 and 1117), drop the helper entirely. Also added
`Number(...) || default` guards so a stale `CFG.CAPTCHA_CLICK_DELAY`
or `CFG.RL_RETRY_DELAY` of NaN/null/undefined falls back to the
DEF value rather than making `setTimeout(NaN)` fire instantly.
Side effect that confirmed the bug: the captcha bg element lost
its layout during the storm, so `rect.width = 0` and
`nx * rect.width = 0`, but `rect.left` was ~-9992 from a stale
frame ref — hence the marker spamming `(-9992, -10029)`.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>