oh-my-opencode/docs/reference/known-issues.md

# Known Issues

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)

### Symptom

A delegated child session that fails on its very first `promptAsync` call (for example, the provider rejects the request before any session history is persisted) may not advance to the configured fallback models. The session ends in early failure instead of retrying with the next fallback in the chain.

This affects subagents launched via the delegate-task tool (background or sync) where the first provider call fails immediately and `session.messages` is still empty.

### 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.

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).

The original failure-mode the PR targets remains in v4.2.0.

### Workaround

- For delegated subagents, prefer providers that succeed reliably on the first call (rarely fail with auth/quota errors at request time).
- 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

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.