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docs(known-issues): reference delegate fallback tracking issue

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Update the v4.2.0 known issue with the filed follow-up issue and exact PR #3825/#4044 commit details.

Refs #4059.
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YeonGyu-Kim
2026-05-16 01:34:38 +09:00
parent 1590085f7b
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docs/reference/known-issues.md
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Tracks bugs that are present in the current release but have been intentionally deferred. Each entry should explain the symptom, the history, any workaround, and the planned resolution.
## v4.2.0 - Delegated child-session early-failure fallback (PR #3825 deferred)
## v4.2.0 - Delegate-task early-failure-fallback (BLOCKER-4, deferred from PR #3825)
### Symptom
@@ -12,9 +12,9 @@ This affects subagents launched via the delegate-task tool (background or sync)
### History
PR #3825 (`tw-yshuang/fix/delegated-child-session-early-failure-fallback`, merged as commit `fac90d69f` on 2026-05-07) introduced a shared bootstrap context (`src/shared/delegated-child-session-bootstrap.ts`) to capture the retry payload before the first prompt dispatch, so empty-history failures could still retry with the fallback chain.
PR #3825 (`tw-yshuang/fix/delegated-child-session-early-failure-fallback`, commit `fac90d69f`, author `tw-yshuang`, merged on 2026-05-15) introduced a shared bootstrap context (`src/shared/delegated-child-session-bootstrap.ts`) to capture the retry payload before the first prompt dispatch, so empty-history failures could still retry with the fallback chain.
After the merge landed on `dev`, the PR's own regression test (`delegated child-session empty-history fallback retries with captured bootstrap prompt` in `src/hooks/runtime-fallback/index.test.ts`) failed on a clean root `bun test --timeout 30000` run (6828 pass / 1 fail). PR #4044 (`code-yeongyu/revert/3825-delegated-bootstrap`, merged on 2026-05-15) reverted the merge to keep `dev` green (6823 pass / 0 fail / 6 skip across 709 files).
After the merge landed on `dev`, the PR's own regression test (`delegated child-session empty-history fallback retries with captured bootstrap prompt` in `src/hooks/runtime-fallback/index.test.ts`) failed on a clean root `bun test --timeout 30000` run (6828 pass / 1 fail). PR #4044 (`code-yeongyu/revert/3825-delegated-bootstrap`, commit `3c7d1299a`, merged on 2026-05-15) reverted the merge to keep `dev` green (6823 pass / 0 fail / 6 skip across 709 files).
The original failure-mode the PR targets remains in v4.2.0.
@@ -24,6 +24,6 @@ The original failure-mode the PR targets remains in v4.2.0.
- Configure fallback models conservatively in `categories[].fallback_models` and accept that the very first failure may not auto-retry.
- The existing runtime-fallback persisted-history retry path still works after the subagent produces any history.
### Planned Resolution
### Tracking
Reland will target v4.2.1 once the regression test is stabilized against the post-#4032 schema-compatible synthetic tool result shape and the prompt-async-gate's dispatch timeout + post-dispatch hold semantics. A follow-up issue will be filed to track this work.
Issue #4059 tracks the reland with stabilized regression coverage. The reland is deferred to a follow-up release and should account for current schema-shape changes plus prompt-async-gate semantics.