[don't merge me] - designed to show write lock in merged() is no longer needed after #5701 #5825
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This contains two changes that are in #5701 but does not include the other the changes.
The purpose is to demonstrate that without the other changes in #5701, taking a write lock is necessary to ensure thread safety.
The fact that the test case executes successfully after #5701, shows that the protection offered by taking the cache write lock is no longer necessary because #5701 introduces entry locks that offer the required protection.