Fri Nov 22 2019 17:36:50 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
45111 Apache h mod_user bugs NEW --- make mod_usertrack use mod_unique_id if available 2008-06-01
One bug found.

as

File a new bug in the "mod_usertrack" component of the "Apache httpd-2" product