`Get-Command -UseFuzzyMatching` output includes duplicates

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues.
• Refer to the FAQ.
• Refer to Differences between Windows PowerShell 5.1 and PowerShell.

Steps to reproduce

Get-Command -Name Get-ChildItem -UseFuzzyMatching

# Or with -FuzzyMinimumDistance specified:
Get-Command -Name Get-ChildItem -UseFuzzyMatching -FuzzyMinimumDistance 5

Expected behavior

With either example command, only unique results are produced.

CommandType     Name                                               Version    Source
-----------     ----                                               -------    ------
Cmdlet          Get-ChildItem                                      7.0.0.0    Microsoft.PowerShell.Management
Cmdlet          Get-Item                                           7.0.0.0    Microsoft.PowerShell.Management

Actual behavior

Duplicate results are produced by either example command.

CommandType     Name                                               Version    Source
-----------     ----                                               -------    ------
Cmdlet          Get-ChildItem                                      7.0.0.0    Microsoft.PowerShell.Management
Cmdlet          Get-ChildItem                                      7.0.0.0    Microsoft.PowerShell.Management
Cmdlet          Get-ChildItem                                      7.0.0.0    Microsoft.PowerShell.Management
Cmdlet          Get-Item                                           7.0.0.0    Microsoft.PowerShell.Management
Cmdlet          Get-Item                                           7.0.0.0    Microsoft.PowerShell.Management
Cmdlet          Get-Item                                           7.0.0.0    Microsoft.PowerShell.Management

Cursory testing shows that at most, two duplicate results are produced irrespective of the command or -FuzzyMinimumDistance (but sometimes it's one or zero duplicates).

Environment data

Name                           Value
----                           -----
PSVersion                      7.6.0-preview.5
PSEdition                      Core
GitCommitId                    7.6.0-preview.5
OS                             Microsoft Windows 10.0.19045
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0, 5.0, 5.1…}
PSRemotingProtocolVersion      2.4
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Reproduce the duplicate results with Get-Command -Name Get-ChildItem -UseFuzzyMatching, including the FuzzyMinimumDistance variant, then trace the fuzzy-matching path for Get-Command. Done means both commands return only unique results matching the expected output shown in the issue.