Agent reported that it could not complete the task

ERR_API: Failed to checkout PR branch: git fetch failed with exit code 128: warning: redirecting to https://github.com/github/gh-aw.git/ fatal: couldn't find remote ref purelock/lock-policy-functions-20261021-e5c6a903bbc71285

Attempted to check out: purelock/lock-policy-functions-20261021-e5c6a903bbc71285

Error message: git fetch failed with exit code 128: warning: redirecting to https://github.com/github/gh-aw.git/ fatal: couldn't find remote ref purelock/lock-policy-functions-20261021-e5c6a903bbc71285

PR number: 70891

Event type: pull_request

Skill conflict (scope_collision): reporting in .github/skills/reporting, staged/.github/skills/reporting

Unified session: job duration unavailable for agent (missing or invalid completed-job timing)

No Copilot session state files found in /tmp/gh-aw/sandbox/agent/session-state or /home/runner/.copilot/session-state

PR #70891 closed before its head could be fetched. Stopping rather than running on the previous checkout.

Test Quality Sentinel pre-fetch unavailable: unable to fetch test file diff

"The ubuntu-latest label will migrate to Ubuntu 26 beginning October 19, 2026. For more information, see https://github.com/actions/runner-images/issues/14748"

Directory does not exist: /tmp/gh-aw/mcp-logs