cached javascript issues when accessed on multiple servers

There is still an issue with javascript merging which happens occasionally when running as cluster. Can we look at making the merge code a bit more robust?

Look for JavaScript merging and caching logic in the codebase, likely in server-side rendering or asset pipeline modules. Examine cluster-related code to understand how multiple servers interact. The goal is to make the merge code more robust, but the issue lacks specifics on what 'occasionally' means or how to reproduce the problem.

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