Upgrading to the latest version should fix most known issues with Show duplicates.
The issue in the post you linked was fixed in 2.1.36.
There is also another issue fixed recently in 2.1.38beta1.
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Upgrading to the latest version should fix most known issues with Show duplicates.
The issue in the post you linked was fixed in 2.1.36.
There is also another issue fixed recently in 2.1.38beta1.