[tryout fix] concurrency bug in NamespacedHierarchicalStore#computeIfAbsent(Object, Object, Function) junit-team#5171 junit-team#5209

Signed-off-by: Vincent Potucek <vpotucek@me.com>

Author: Vincent Potucek

documentation/modules/ROOT/partials/release-notes/release-notes-6.0.2.adoc

@@ -17,13 +17,6 @@ repository on GitHub.
 ==== Bug Fixes
 
 * Make `ConsoleLauncher` compatible with JDK 26 by avoiding final field mutations.
-* Fix a concurrency bug in `NamespacedHierarchicalStore.computeIfAbsent` where
-  the `defaultCreator` function was executed while holding the store's internal
-  map lock. Under parallel execution, this could cause threads using the store to
-  block each other and temporarily see a missing or incorrectly initialized state
-  for values created via `computeIfAbsent`. The method now evaluates
-  `defaultCreator` outside the critical section using a memoizing supplier,
-  aligning its behavior with the deprecated `getOrComputeIfAbsent`.
 
 [[v6.0.2-junit-platform-deprecations-and-breaking-changes]]
 ==== Deprecations and Breaking Changes