[iFixRobots]

On native Instagram login, after the reCAPTCHA, recaptcha_submit can answer with a native dialog such as "The password you entered is incorrect." We open the dialog, but in the same step the login fails with:

submitting reCAPTCHA token: unexpected bloks typecheck for *bloks.BloksIllegalValue

so users get the generic "couldn't complete this sign-in step" error and never see what Instagram said.

The webview callback passes the result of the recaptcha_submit action to its success callback, which checks (bk.action.mins.TypeOf result) against 7 to see whether it got a map. Here the action is ig.action.cdsdialog.OpenDialog, which returns BloksNothing, and getBloksType errors on it. This returns 5 for it, the tag native code uses for values without a specific type, so the callback skips its map branch and the dialog becomes the normal dialog login step.

Verified by replaying two production recaptcha page + recaptcha_submit responses through Browser.DoLoginStep with a fake token:

• main: submitting reCAPTCHA token: unexpected bloks typecheck for *bloks.BloksIllegalValue
• this branch: fi.mau.meta.instagram.caa.dialog step with "The password you entered is incorrect." and an OK option

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  {
    "summary": "No issues found in the TypeOf change.",
    "findings": []
  }