diff --git a/docs/reference/known-issues.md b/docs/reference/known-issues.md
index 61165b6a8..035ae5b10 100644
--- a/docs/reference/known-issues.md
+++ b/docs/reference/known-issues.md
@@ -2,7 +2,7 @@
 
 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`, merged as `cd33f3a39` and then `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).
+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`, revert commit `3c7d1299a`, merge-revert commit `e2b8e49e2`, 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.