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Get-help may return multiple instances of the same help file #3410
While building directories to search it may add the default shell directory twice to the list of directories to search (this is more of a perf issue of searching it twice than the root cause of the problem)
When a file is found, it generates a new unique key, however, the unique key is based on the root folder and not the actual one that contains the file, so a duplicate can result.