Thu Dec 3 2020 23:59:54 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
28652 Taglibs Standard dev RESO DUPL c:url generates invalid urls 2004-11-16
One bug found.

as

File a new bug in the "Standard Taglib" component of the "Taglibs" product